Re: Garmin Etrex - ORdnance Survey Grid reference nos
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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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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Unfortunately Garmin satnavs do not allow OS Grid References instead of Longitude and Latitude. However if you need to find the Longitude and Latitude of a point it can be done by going to http://www.gorissen.info/Pierre/maps/googleMapLocationv3.php Zoom in on the location you want and left click on it. The longitude and latitude will appear in a box to the right of the map. You need to set the co-ordinate system of the satnav to match the longitude and latitude format of the satnav. To do this touch Where to, Co-Ordinates, Format. Enter the co-ordinates and touch next. It's not an ideal solution but it might help you out if you're stuck.
If you press in the control stick, it will make a waypoint at your location and you can see the co-ordinates. The numbers can be displayed in various ways, all depends the settings you have used in the Etrex. Your bearing will be on your Navigation Page. http://www8.garmin.com/manuals/eTrex_OwnersManual.pdf