Thanks for your replies. Hi Golden Haystack, I’ve just looked at the Garmin and I have Normal, WEES/EGNOS and Demo. I guess I use Normal but I really don’t know. I don’t even know what the other one is! Can I download software for WGS84, or is it a case of my Garmin just doesn’t have it?
I met Windrush the other day and we both entered the same co-ordinates in the same way, and mine was confirmed 100m out, so I might just have a tempremental one! I have a Garmin 400t if anyone else has one…..