ETrex Legend, GPS Coordinates from Google Earth Don't Match Basemap
I obtained GPS coordinates from Google Maps and entered the coordinates (correctly) into the unit as a waypoint. The location of the waypoint is significantly off compared to the basemap of the Etrex legend.
Even moving the arrow on the legend to known intesections of major roads and comparing the readout to google map coordinates of the same place shows significant difference.
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Re: eTrex Legend, GPS Coordinates from Google Earth Don't...
Are you sure you're using the exact same format on GoogleEarth and your GPS?
GoogleEarth: save the waypoints in a KML file (NOT KMZ) to your computer, naming it appropriately. Go to http://www.gpsvisualizer.com/gpsbabel/ and convert the KML file to a GPX file, using their converter. They will present you with a file to download. Download it and send those waypoints to your unit and you'll be set to go.
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Coordinates can be entered by marking the waypoint and editing it. From the map screen, press the joystick down for 2 seconds to mark the waypoint. Toggle up to the coordinates and press the joystick to enter the edit mode. Make the changes to the coordinates to the new coordinates and toggle to OK, press the joystick to enter the coordinates.
You need to make sure your GPS unit and Google maps are using the same map datum. In your user manual: http://static.garmincdn.com/pumac/eTrexLegend_OwnersManual.pdf Page 44, Setup Options, Units, Position Format: I suggest setting to: hddd.ddddd as this is the digital format and easier to read
In Google Maps, right click - Drop Latitude/Longitude marker and this should show the co-ordinates in digital degrees. Alternatively, you can hit the SEND button in GoogleMaps, and it will send the marked location to the GPS via the Garmin website. You may have to install the Garmin plug-in into your browser first, but it's well worth it.
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Consistent errors are usually projection or datum related. If you are taking coordinates collected in one projection and displaying them in your GPS in another, you the points will offset. I'm not talking about the decimal degrees 00.000n 000.0000w vs 00 00 00N 00 00 00W. I'm talking about the geographic model to represent the surface of the earth. Google Earth generally uses a geographic projection with WGS 1984 or WGS84 Datum. Make sure you are using the same settings on your GPS.
In GoogleEarth, change your coordinates to decimal format. In your Lowrance GPS, change that format to decimal. You don't mention which Lowrance model so I can't find the online manual to tell you exactly how to do it.
GoogleEarth: save the waypoints in a KML file (NOT KMZ) to your computer, naming it appropriately. Go
to http://www.gpsvisualizer.com/gpsbabel/ and convert the KML file to a
GPX file, using their converter. They will present you with a file to
download. Download it and send those waypoints to your unit and you'll
be set to go.