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How to change datum settings on Legend eTrex

Trying to change the datum to suit harvey maps of the lake district, any one know the answer

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Re: how to change datum settings on Legend eTrex

Garmin legend has the datum settings in the system settings menu, under UNITS search for datum hope this helps

Posted on Aug 16, 2007

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A good software programme for putting maps onto a garmin etrex legendhcx

Try an Old Garmin "Mapsource" version and maps data with very low quality. I read somewhere that new versions of mapsource can't load map to Legend types

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I have a Garmin etrex handheld unit. The gps data from it does not correlate with google maps gps coordinates at all. There is a 30 mile, not feet but mile difference in the waypoints. Any idea what I may...

You need to make sure your GPS unit and Google maps are using the same map datum.
In your user manual:
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.

If this solves your problem, please come back and rate our solution, thank you.

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1 Answer

Consistent error entering garmin etrex coordinate in google earth

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.

Apr 09, 2010 | Garmin eTrex Legend GPS Receiver

1 Answer

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Your MicroSD card may be full just from the basic maps. Try larger card for additional maps. The vendors supply the minimum to keep the cost low and then force the customer to upgrade the resources at their own expense.

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If the GPS is off, the unit will not find any satellites. The GPS off - option is for planning routes etc. You can have the maps, but no satellite fix.

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1 Answer

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The preloaded maps are VERY generic, mostly major highways. They are not useful for geocaching.

The good news is that you can download free topo maps created by a very generous Canadian soul, Dale Atkin. The maps are free but donations are accepted. He is also working on US topo maps. I've used Ibycus and Garmin topo maps and prefer the Ibycus version.
If this solves your situation, please come back and rate our answer. Thankyou.

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You can purchase the Bluechart Marine maps for your area online at They will sell you an unlock code for a specific area.

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You shouldn't have to connect to a computer. I don't have an OS map in front of me but I'm guessing they use UTM with a WGS 84 datum (if the map was produced after 1984 that is). Got to the Setup page then select Units. Change Position Frmt to UTM/UPS and Map Datum to WGS 84.

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Have you checked if you have selected the correct Datum for your location, usually is WGS84

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