CompuServe Messages

SA is only applied to 1 or 2 satellites at a time: they just don't tell you which ones, and they jump it about. It's quite probable that you positioned yourself using uncorrupted data. NB: I've only just started looking at this thread (pity, really), but I see you all talking about accuracies, the need for good maps etc. Are you guys aware when using your maps that the GPS units, as a default, generally output positions in WGS 84 datum, and that your maps, in the US, are likely to be in NAD 27 datum, still, in most places? Thus plotting your position on a NAD map without selecting NAD output on your rx will put you out of position by around 150 metres. Rob