Marcel, On Sun, 29 Jul 2007 15:12:37 -0700, Marcel Birthelmer wrote: > Howard, > have you considered cracking open the GPS unit and checking if it's > maybe just a USB-serial converter in disguise? Maybe you can just tap > the UART signals somewhere and splice in a 232 level converter or > something like that. Thanks for the suggestion - I am tempted, but my recent "have a look inside" record rather puts me off. I did this with a rather expensive mobile phone, and it's now a pile of parts, some of which will never play the violin again... I used to be very good at taking things apart, and fairly good at putting them back together, but my present eyesight and usual clumsiness, together with a very sophisticated physical design of the phone, are all conspiring against me. I'll wait until things improve and I think I can do it without wrecking it (I've lost a lot of the acuity in my right eye, which they tell me will get better in a few weeks. The only consolation is that the opthalmologist said that the condition (Central Serus Retinopathy) was "found in young males"! :-) Cheers, Howard Winter St.Albans, England -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist