*nod*

I had been to this page and it is one of the ones that made me think that the DGPS info might be able to be dealt with from the software side... but reading further I see that GPS data can only be post-processed with DGPS if you can get the receiver to output pseudo-range information...

So I have to work out whether I can get my receiver to output this pseudo-range data (unlikely) or find out whether my receiver has any commands to upload DGPS data to it (probably just as unlikely)

I have found a few pages that list some of the commands people have got working with the Tripmate... seems most have been found by trial and error so maybe if I could work out what commands are used to upload DGPS data to other GPS receivers one of those might work...

I will have a hunt around the gpsd sources...

Kim