Thanks for the reply.
MOBAC have removed Multimap (along with most other sources) from their
latest release so I only have the OpenStreetMaps and no OS maps which
is a real pain :-( Do you know if there's an earlier version I can get
hold of with it still in? I've tried googling how to get OS maps into
MOBAC but haven't found anything.
With the gps accuracy, at times the SNR was above 100 (ranged from 75
to 135 I think) from 7 satellites and the placement of the red arrow
(until it updated when I was standing still and it go worse) was very
good. The accuracy was generally 20 to 30 metres so it's a wonder the
red arrow was so correct most of the time. Either way, it's far better
than the Garmin Etrex I had once that was consistently 100m off on the
northing, even after selective availability was turned off...
Dan.