Surveyors connected each monument location using mathematical techniques like triangulation. Geodesists use a horizontal datum as the model to translate a spheroid/ellipsoid into locations on Earth with latitude and longitude lines. In case you have coordinates in CSV file somewhere online, you can call this request: Thanks for contributing an answer to Geographic Information Systems Stack Exchange! Download the free Excel template to perform the following operations: - Conversion of UTM Coordinates to Decimal Degrees. after selecting the coordinate conversion button. I wonder if the developer of this app has folded andits no longer available. How to convert WGS84 to NAD27 in pygeodesy? 10 Topographic Maps From Around the World, Ocean Currents Map: Visualize Our Oceans Movement, Esri JavaScript API Examples: 15 High-Tech Webmaps and Webscenes, 50 Map Projections Types: A Visual Reference Guide [BIG LIST]. Description: (0,) Covered area powered by MapTiler United States (USA) - Delaware and Maryland. Surveyors installed brass or aluminum disks at each reference location. Unfortunately, NAD27 is not a simple mathmatical formula. Right-click total to add Max, Min, Count, Average. No plugin or software installation is required for you.. Powered by Aspose.GIS. convert nad27 to wgs84 formula. Method: NADCON Datums precisely specify each location on Earths surface in latitude and longitude. The following projection file converts an NAD27 dataset to an NAD83 dataset in Canada: Why y-coordinates may seem 200 meters too large. 1. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If the figures will always be the same numbers of characters, and the points always in the same relative positions then this formula will do the job: Code: =LEFT (A2,2) &"."&MID (A2,3,8)&"."&RIGHT (A2,4) I put your example data in A1, hence the reference. For example, EPSG:4326 and EPSG:4267 are reference codes for WGS84 and NAD27, respectively: will return the corresponding coordinate in NAD27. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. A datum defines the radius, inverse flattening, semi-major axis, and semi-minor axis for an ellipsoid. Available transformations. The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS.The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM). We reference all coordinates on Earth to a datum. As the name implies, datum transformations transform your data from one datum to another. Has anyone else used this app and experienced the same thing? The Add Coordinate Format dialog will appear. Its important to note that the physical location has not changed. For all practical applications, NAD83 is the same as WGS84. This difference is known as a datum shift. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Conversions between NAD27 and WGS84. When you combine these measurements, we arrive at a geodetic datum. There is a basic ellipsoidal projection, but then you are supposed to apply offsets from one of several gigantic tables (basically 200 years of empiracly derived and measured data). We have a great community of people providing Excel help here, but the hosting costs are enormous. In this case, you would need to perform a datum transformation. At a geodetic or ellipsoidal height h, . I'll investigate the information you have all provided and see if it helps. Here's an example. MERCEDES I would recommend proj4js. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup, On the fly transformation From WGS84 to NAD27 with proj4 code, Transform from WGS84 to Cylindrical Equal Area, Transform coordinates in csv file from wgs84 to nad27 using qgis, Troubleshooting the use of OpenLayers Plugin layers with Midvatten Plugin in QGIS. http://everest.hunter.cuny.edu/mp/software.html. Never before have we been able to estimate the ellipsoid with such precision because of the global set of measurements provided by GPS. Read More. A horizontal datum provides a frame of reference as a basis for placing specific locations at specific points on the spheroid. This converts between NAD27 and NAD83 (1986) using the NADCON transformation. In surveying and geodesy, we accurately define these properties with geodetic datums. There is a basic ellipsoidal projection, but then you are supposed to apply offsets from one of several gigantic tables (basically 200 years of empiracly derived and measured data). developers.google.com/maps/documentation/javascript/, How Intuit democratizes AI development across teams through reusability. If you have questions about obtaining a more reliable transformation in major urban centers or other areas that are densified, contact ESRI Canada Limited for further details. Sad to see it disappear. In order to create a geodetic datum, surveyors undertook a mammoth collection of monument locations in the late 1800s. The link is as follows: http://webapp.geod.nrcan.gc.ca/geod/ Conclusion Actually, because of these changes, there is more than one version of NAD83. I was hoping to see a difference between the two layers, but I saw none. Learn more about Stack Overflow the company, and our products. 10 comments caleb87 commented on Oct 5, 2016 proj4php/proj4php#53 1720. The default NAD27 to WGS84 transformation is NAD_1927_To_WGS_1984_1, . I suspect the group that originated the app got bought out or has disbanded. All input and output linear units are in meters. datums. Point databases and shape files can be converted from SPCS to lat-long, which is required to use them in the program. It provides latitude and longitude and some height information using the reference ellipsoid GRS80. Coordinates on a map The latitude and longitude location in the NAD27 datum differs from NAD83 or WGS84. Why do many companies reject expired SSL certificates as bugs in bug bounties? Making statements based on opinion; back them up with references or personal experience. (I never took any GIS classes in school, and I've only been working at this for a few weeks.). How to Convert Coordinates using ExpertGPS Step 1: Configure your input and output coordinate formats To add a coordinate format in ExpertGPS, click Preferences on the Edit menu, and click on the My Coordinate Formats tab. Is there a proper earth ground point in this switch box? Do new devs get fired if they can't solve a certain bug? In near offshore regions, results will be less accurate but seldom in excess of 5.0 m. Farther offshore, NAD27 was undefined. Result is 39.748289809487346 -104.99917122555918. i made the assumption that ellps value unchanged without knowing what extact projection your data is in. Proper gdaltransform syntax to transform a list of coordinates? A datum defines the following parameters for an ellipsoid: The North American datum of 1983 (NAD83) is the current horizontal or geometric datum for the United States. To get NAD83 to WGS84, input coordinates in NAD83 format into the fields, then click the Convert button. NAD83 corrects some of the distortions from NAD27 over distance by using a more dense set of positions from terrestrial and Doppler satellite data. Having failed to recently update I delete them attempted to download again. Proj4php is an OSGeo community project. For application in Gulf of Mexico refer to IOGP report 373-26. You can open imagerywith a world file. If you want to use PHP, you could use Proj4PHP. See also: Proper gdaltransform syntax to transform a list of coordinates? 2. NAD27 and NAD83 -- Significant difference exists between NAD27 and NAD83. Cliff Mugnier. Our Platform This free online Conversion application is provided by Aspose.Gis. Have you research the problem? Click this link to visit the forums. NAD27 stands for the North American Datum of 1927. If you have an account, sign in now to post with your account. The currently accepted method is an error averaging, rubbersheeting approach. There is an ongoing effort at the state level to readjust the NAD83 datum to a higher level of accuracy using state-of-the-art surveying techniques that were not widely available when the NAD83 datum was being developed. Since 1986, geodesists have made several updates to NAD83. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I've been asked by some users of my Spreadsheet if i could add the the conversion from WGS84 to NAD27. Chris, try this link out http://www.gpsu.co.uk/. Select a range of cells. The average correction between NAD27 and NAD83 is an average of 0.349 northward and 1.822 eastward. North American Datum of 1927 (NAD27) and the North American Datum of 1983 (NAD83). Conversion between NAVD 88 and the commonly used NGVD 29 varies spatially; however, over most of the study area the following conversion can be used: NGVD 29 = NAVD 88 -3.6 feet. About an argument in Famine, Affluence and Morality. The North American Datum of 1983 (NAD83) is the most current datum in North America. Are you suggesting that Google Maps uses the NAD27 datum? Overall, it established a network of standardized horizontal positions in North America. He has a program used to make conversions between coordinates and datums - work nice. But given that the datum of the coordinate matches the datum used on the map, you will see no difference in the physical location. Before the current datum was defined, many maps were created using different starting points. Projected coordinate systems are based on geographic coordinates, which are in turn referenced to a datum. In near offshore regions, results will be less accurate, but seldom in excess of 5.0 meters. Select the Input SRS (the default format is WGS84). What is the formula to convert WGS84 coordinates to EPSG 2163? Your email address will not be published. One of the primary differences is that NAD83 uses an Earth-centered reference, rather than a fixed station in NAD27. - Conversion of Coordinates in Degrees, Minutes and Seconds to Decimal Degrees. Surveyors and geodesists created a global ellipsoid model because of the enhancement of computing capabilities and GPS technology. Go to the menu File>Options Select Advanced At the bottom of the list of options, check the option " Use 1904 date system " Customize the time format Now, let's customize the format of our cell: Open the Format cell dialog box ( Ctrl + 1) Select the option Custom In the Type box, enter this format code exactly as it is displayed below One of the most clear, concise, descriptions I have read. The GRS80 reference ellipsoid has a semi-major axis of 6,378,137.0 meters and a semi-minor axis of 6,356,752.3 meters. The NAD27 datum was based on the Clarke Ellipsoid of 1866: The NAD83 datum was based on the Geodetic Reference System (GRS80) Ellipsoid: For any type of work where coordinates need to be consistent with each other, you must use the same geodetic datum. Your email address will not be published. Cartisan Total Map Coordinate Converter does anybody have the Marco for this spreadsheet. The first column, labeled Hemisphere, is multiplied times the longitude, and if you leave it blank, the calculated degree value for longitude will always be zero. Be mindful of geographic transformations and how to choose the right one. Experiencing transformation anomalies when performing a Save As to convert coordinates between NAD83-Z14 and NAD27-Z13. However, because the geodetic datums were different, the resulting projected coordinates will also be different. ", "(null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences. The North American datum of 1983 (NAD 83) is the United States horizontal or geometric datum. Connect and share knowledge within a single location that is structured and easy to search. To learn more, see our tips on writing great answers. Can airtags be tracked from an iMac desktop, with no iPhone? Not really. This results in more accurate geodetic datums over time. Contents of the Free Geography Tools Blog copyright 2007-2018; all rights reserved. Datum shifts happen because survey measurements improve. The horizontal datums that form the basis of coordinates of all horizontal positions in North America improve. A geodetic datum uniquely defines all locations on Earth with coordinates. This is a result of the difference between the size and origin of the two spheroids on which the data is being projected. Proj.4 is pretty good, but a perfect example of why I hate to design and execute by committee (with all due respect to the folks overseeing it!). http://everest.hunter.cuny.edu/mp/software.html or, depending upon your platform, you may use stdin/stdout redirection as follows. What video game is Charlie playing in Poker Face S01E07? Where To Buy Maps Online: An Insiders Guide, 50 Map Projections Types: A Visual Reference Guide [BIG LIST], Esri JavaScript API Examples: 15 High-Tech Webmaps and Webscenes, 10 Topographic Maps From Around the World. ", "+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=us_noaa_conus.tif +step +proj=hgridshift +grids=us_noaa_MD.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1", "https://proj.org/schemas/v0.5/projjson.schema.json", '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=us_noaa_conus.tif +step +proj=hgridshift +grids=us_noaa_MD.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1'. The following statement is from the release notes of NADCON Version 2.1, October 1993: The accuracy of the transformation should be viewed with some caution. proj4js cannot transform nad27 datums to nad83 correctly. Datum Transformations Converting Coordinates from NAD27 to NAD83, 25 Map Types: Brilliant Ideas to Build Unbeatable Maps, Ocean Currents Map: Visualize Our Oceans Movement, 3 Wildfire Maps: How to Track Real-Time Fires Around the World. Optimal transformation. For example, ArcMap has seven formulas that convert from NAD27 to NAD83. Canada - Quebec. I suspect theyve had a major website meltdown, and should be back up again shortly; try again later this week. I've been trying to do this for days. It uses 2 files named CONUS.LAS and CONUS.LOS for the conversion. Clear editor. You cannot convert between Old Hawaiian or Alaskan Island and NAD27 because NADCON does not have the necessary information. And even today, people continue to change geodetic datums to make them more accurate. . Answer: EPSG4326 is just the way to identify WGS84 using EPSG. Alaska. For example, NAD27, NAD83, and WGS84 are the most common geodetic datums in North America. When you need to accurately enter latitude and longitude coordinates in a GIS, the first step is to give it a datum. The early attempts at measuring the ellipsoid used small amounts of data and did not represent the true shape of the Earth. The coordinates for benchmark datum points are typically different between geodetic datums. The average correction between NAD27 and NAD83 is an average of 0.349 northward and 1.822 eastward. Surveyors could measure any point with a latitude and longitude away from this reference point based on the Clarke Ellipsoid of 1866. SPCS DEMs SPCS imagery You would have to perform a datum transformation if youre using data in NAD83. NAD27 to HARN equals 0.15m + 0.05m = 0.20m). Why Are Great Circles the Shortest Flight Path? Therefore, the Nadcon computed transformations are extrapolations and no accuracy can be stated." Thanks, Rod. There is no exact mathematical equation that will convert data built from a surface oriented local datum like NAD27, to an earth centered global datum like NAD83. and HARN could combine uncertainties (that is, NAD27 to HARN equals 0.15 m + 0.05 m = 0.20 m). A coordinate transformation is done through a series of mathematical equations. That is why you dont see any difference. However, many of you might have automated your original data layers using NAD27 and continue to do so, primarily because some source data is collected from maps based on NAD27. From the unified network of survey monuments, the result of triangulation was the North American Datum of 1927 (NAD 27). The Add Coordinate Format dialog will appear. Turn off on-the-fly transformations for you project and load the saved NAD27(BLM14) file in. Follow these easy steps to disable AdBlock, Follow these easy steps to disable AdBlock Plus, Follow these easy steps to disable uBlock Origin, Follow these easy steps to disable uBlock. Enter coordinates, select input and output reference system. To more clearly see the difference, relative to your Google Maps points (which may be in a different CRS), load the layer, defining it as having a CRS as WGS84 (probably accurate), then right-click on the layer and choose Save As, defining your project CRS of NAD27(BLM14) for the resultant file. Why do academics stay as adjuncts for years rather than move around? NAD27 was not used officially in Hawaii or the Alaskan islands. You'll want to use some third party tools to do the transform. Set the location to United States, and select NAD27 Datum. Making Maps: A Visual Guide to Map Design for GIS Users can select different grids by clicking on the "select grid" link below. Steps of transformation: If any of . In this case, a datum transformation is necessary. The first thing you should be careful of is that the physical locations have not changed. It consists of a reference ellipsoid, a standard coordinate system, altitude data, and a geoid. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? Can I tell police to wait and call a lawyer when served with a search warrant? At each station, surveyors collected latitudes and longitude coordinates. Copyright 2000-2023 Groundspeak, Inc. DBA Geocaching. To learn more, see our tips on writing great answers. If I use the Map3D querry method to "draw" the wgs84 linework and cad. However, because the geodetic datums were different, the resulting projected coordinates will also be different. Can anyone recommend a good app for multiple datum transformations? NAD_1927_To_NAD_1983_Alaska. ncdu: What's going on with this second size column? Currently, all states have been resurveyed. If you are marking property or land boundaries or building roads or planning for coastal inundation scenarios, you must know about and use the correct geodetic datums. Why does Mister Mxyzptlk need to have a weakness in the comics? Remarks: Transformation steps are from NAD27 to NAD83(HARN) (12) (code 8471) assuming that NAD83(HARN) is equivalent to WGS 84 within the accuracy of the transformation. A common problem is when different coordinate locations are stored in different reference systems. When you transform NAD83 and NAD27 geographic coordinates to projected State Plane coordinates, it is the same projection method. The North American Datum of 1927 (NAD27) is one of the main three geodetic datums in North America. How is an ETF fee calculated in a trade that ends in less than a year? En el botn select coordinate System elegimos el sistema de orgen. If you have 'On-the-fly-reprojection' enabled, you should see the difference between WGS84 and NAD27 for the same coordinate pair: But note that you should use EPSG:4267 NAD27 for this, and not EPSG:32064 NAD27-BLM14, which has US feet as units. Because where would you be on Earth without having reference to it? This has led to the development of global ellipsoid models such as WGS72, GRS80, and WGS84 (current). Projection: 32629 Home | Upload Your Own | List user-contributed references | List all references I have an issue going on the pro4js github: You absolutely right about the issue that proj4js does not have a datum shift grid function included. You can also convert coordinates using many other spatial references. You would need to apply a datum transformation when working with NAD83 data. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Remarks: Transformation steps are from NAD27 to NAD83 (HARN) (12) (code 8471) assuming that NAD83 (HARN) is equivalent to WGS 84 within the accuracy of the transformation. How to transform data points from WGS84 to NAD27? If so, how close was it? I see the list of files here: https://github.com/DotSpatial/DotSpatial/tree/master/Source/DotSpatial.Projections/Nad/GridShifts Which one do I use, if any? Trying to understand how to get this basic Fourier Series. Does anyone know how to do this or where I can find examples on the web? What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? It only takes a minute to sign up. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Solo digan como se convierten y no nos manden a otro sitio a seguir gastando el tiempo. It appears after finishing the conversion process. Convert NAD27 to WGS84 with programming function like PHP, How Intuit democratizes AI development across teams through reusability. You may have on-the-fly transformations on for your project. You can help keep this site running by allowing ads on MrExcel.com. Paste as plain text instead, For example, the National Geodetic Survey has adjusted the NAD83 datum four times since the original geodetic datum estimation in 1986. Geodetic datums form the basis of coordinates of all horizontal positions on Earth. Coordinates Converter is for converting between coordinate systems with one geodetic datum. Due to differences in the method for defining each datum, as well as variations in distortion, the relationship between the NAD27 datum and NAD83 datum cannot be defined at every location by a single mathematical equation. ", "Transformation steps are from NAD27 to NAD83(HARN) (12) (code 8471) assuming that NAD83(HARN) is equivalent to WGS 84 within the accuracy of the transformation. Makes no sense to me but perhaps it will help you. convert nad27 to wgs84 formula June 5, 2022 5:15 pm seaworld san antonio birthday party seaworld san antonio birthday party On the other hand, if we use CORS coordinates data, or the OPUS service, the NAD83 reference frame to which these High Accuracy Reference Network (HARN) and High Precision Geodetic Network reworked geodetic datums from 1986 to 1997. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Nearly all published statements about the amount of shift between NAD27 and NAD83 are shifts measured in meters on unprojected (latitudelongitude) data. I tried in gdal, How Intuit democratizes AI development across teams through reusability. United States (USA) - Delaware and Maryland. For a better experience, please enable JavaScript in your browser before proceeding. NAD 27 and NAD 83 provide a frame of reference for latitude and longitude locations on Earth. Datum shifts happen because survey measurements improve, there are more of them and methods of geodesy change. If your data is already in NAD27, do not use these options. The WGS84 datum. It is a false assumption that a coordinate value based on the 1927 North American Datum is less accurate than one based on NAD 83 or WGS 84. ", "Parameter files are from NAD83 to NAD83(HARN) (12) (code 1485) assuming that NAD83(HARN) is equivalent to WGS 84 within the accuracy of the transformation. 1241 Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, var functionName = function() {} vs function functionName() {}, Reference Guide: What does this symbol mean in PHP? It is known locally as the National Transformation and will be referred to in this document and the software as the Canadian National Transformation. Do you have any affiliation with MyGeodata Cloud? - YouTube GIS: Convert NAD27 to WGS84 with programming function like PHPHelpful? If so then it does the transformation for you. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. In the top box, select NAD27 if it isn't. North American Datum of 1983 is based on the reference ellipsoid GRS80 which is physically larger than NAD27s Clarke ellipsoid. I was hoping to see a difference between the two layers, but I saw In near offshore regions, results will be less accurate but seldom in excess of 5.0 m. Farther offshore, NAD27 was undefined. Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Therefore, the NADCON computed transformations are extrapolations and no accuracy can be stated.. The grid zones UTM 31N to 37N differ from the standard zone for the Northern Hemisphere, in part to accommodate the southern half of the Kingdom of Norway. This tool permits the user to convert latitude and longitude between decimal degrees and degrees, minutes, and seconds. At the 67 percent confidence level, this method introduces approximately 0.15 m uncertainty within the coterminous United States, 0.50 m uncertainty within Alaska, 0.20 m uncertainty within Hawaii, and 0.50 m uncertainty within Puerto Rico and the Virgin Islands. Most overview landmarks have not moved. Even today, geodesists are continually improving horizontal geodetic datums. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Has 90% of ice around Antarctica disappeared in less than a decade? Click on the "Convert" button. This difference is known as a datum shift. For example, NAD27, NAD83, and WGS84 are geodetic datums. 3 Answers Sorted by: 6 Did I actually transform my data points from WGS84 to NAD27? By default, it will be created on the Clarke 1866 spheroid. As the name implies, datum transformations transform your data from one datum to another. Your email address will not be published. Has 90% of ice around Antarctica disappeared in less than a decade? Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal accuracy. It has been implemented within the Project tool. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. We begin modeling the Earth with a sphere or ellipsoid. Not the answer you're looking for? As time went on, the number of stations also grew. Shopping at Amazon through the link below helps support the site. Enter your coordinate data in the areas highlighted in green in the spreadsheet. Thanks! And since the beginning of the 19th century, the dimensions of the ellipsoid have been calculated at least 20 different times with considerably different accuracy. you should have the on-the-fly projection setting turned on this could be the answer to the discrepancy question. Click Add. But where can I find the origin alignment, axis rotation, and scale information that will allow me to relate Clarke 1866, GRS80, and WGS84? ", "United States (USA) - Delaware and Maryland. Is a list of projection packages, many public domain with source. I've been asked by some users of my Spreadsheet if i could add the the conversion from WGS84 to NAD27. For example, surveyors benchmarked approximately 250,000 stations. How do you convert from GPS data in WGS84 to a GIS built in NAD27 in ArcGIS? How to tell which packages are held back due to phased updates. A number of methods have been proposed for performing the datum adjustment. Identify those arcade games from a 1983 Brazilian music video. So if you do a transformation with Save As from EPSG:4326 into EPSG:32064, the points of the WGS84 and BLM14 layer should be on top of each other. Comments are currently closed; feel free to contact me with questions/issues. Area of use: United States (USA) - Delaware and Maryland. How accurate do you need the transform? Scope: (null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences. It was a purchased app but recently failed to update. In this case, a datum transformation is necessary. Click "Open Map" (appears after the end of the conversion) to visualize the converted coordinates on the World map. When you do click on the datum, it shows various parameters that it uses. The following projection file converts an NAD27 dataset to an NAD83 dataset: The following keywords (and associated regional coverage) are valid datum names when using the NADCON method for datum transformation. These files are also included with the source code (they were on the Web (they're public domain)). Assuming your original coordinates are actually WGS84, you just assigned an erroneous CRS of NAD27 (BLM14) the second time you imported the data. You should see the difference between the projections, i.e. Thus, when the receiver tell us that the computed coordinates using GPS observations are referred to the WGS84, they actually mean WGS84(G1150).
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