in discussion Hidden / Per page discussions » Gps Position Formats And Map Datums
If you pick positions off OS maps, or report in a position based on an OS map, or using an OS map to find someone using their "Landranger" ordnance survey reference; need to be aware that these all use the OSGB36 datum.
I have seen on the very basic Etrex (not suitable for competition admittedly) that you could set it to "OSGB Grid" but have any datum you liked. Result - (cross country) pilots ringing in an incorrect "TM135635" style location.
In summary:
- If using GPS in "ordnance survey" mode then needs to be OSGB Grid and OSGB(36) datum.
- If working in long-lat, use WGS84.
First year of competition for me this year, so will be interesting to see how this works in real tasks.
