GEKO 315 and OSGB problems ?

[Hippyandy]

Firstly apologies I have just posted this on the beginners general GPS forum and found this forum:

HI, can anyone let me know what I should select in the setup menu for "position format" and "map datum" to amke my geko compatable with OS maps.
I have played with a few settings in the "location" screen but the best I have managed to get is a screen with "BNG" on it that does show the "SK" prefix of my local 1:25 000 map. BUT there isn't a normal 6 or 8 firgure grid reference shown. Any help gratefully appreciated (I've just moved from an old Magellen unit so the Garmin set up is a bit strange still)
Andy

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