Quadbarrel

Great. Just been out and found 4 geocaches. DrDick&Vick is right that I need to manually select the datum in my etrex. When I did that I got the coords spot on using both systems so thanks to all for the sound advice. Happy geocaching!!

Thanks guys. Seems to be simple and I will go and try it out this afternoon!!!

Ok, just done a wiki search on OSGB following Simply Paul and Just Roger's replies. Gives a great description of the differences between British Grid OSGB and WGS84. Just need to see if I can change the settings in my GPS.

And dumb questions continuing, is that change done in my GPS unit?

Hmmm. Now that sounds like a good question, but my dumb reply is along the lines of how would I know?

Ok. Apologies in advance for a newbie question. I have tried looking round the forums but can't see an obvious (in language I understand) answer to this. Quite new to geocaching but loving it. But. I use Garmin Etrex which is great. When I use the British Grid system, the references I get for the geocaches are spot on. But when I use the Degrees and Minutes, there seems to be some problem with the Westing reference. For example. Went to "Floak" yesterday. GCXVMG. British Grid is NS50602 51888. Stood at the cache I got NS 50603 51890. So just about spot on. The Degrees and Minutes Reference is N 55 44.239 W 004 22.866. I got N 55 44.240 W 004 22.785. So the Northing was fine but the Westing is out sufficiently to make it just about impossible to find a cache using this reference. I check ed 2 others yesterday and they both were a similar error on the Westing with the Northing fine (having found the cache using the British Grid). I have a feeling there will be an obvious answer and I will feel stupid. But I am happy to feel stupid if someone can help!! Thanks in advance to all the celeverer people out there! QB.