Palm OS

I have a Sprint Treo 600, but I'm thinking of going GSM with T Mobile (I travel the world at least 1-2 times a year). Coincidently, my old Garmin boat GPS died, and I'm trying to find out about using the Treo with an available GPS unit.

I've found a few hardware GPS add-on units on the web. I've also found some software for streets and for boats, but have never talked with someone who actually used this system...I'd sure like to.

The boat use would be very seldom, so I don't want to spend big bucks on a stand-alone unit, even though the display would be bigger. I found a marine mapping GPS software for Palm OS with free maps once you buy the initial software for $180.

Athough I've never used a street GPS, it may be fun to have. I would use that much more often. I haven't ccommitted either to a carrier or to a 600 vs. 650 with whoever I switch to, and there is no hurry.

I would rather research well for a while (even months if needed) and buy the best fit for my needs.

I'm a little worried about reports of 650 issues. I would be happy with a 600 but if the 650 is much more suitable, I don't mind waiting till the bugs are discovered and addressed. I hear the new OS on the 650 uses more memory, but if it works with a GPS better, I'd consider the 650 and add memory.

If it helps you advise me, I never use the camera, am happy with the screen detail on the 600, don't mind having a cord on my earpiece, and don't use the web features at all (I have much faster web at home and work). I'm not sure I need bluetooth, but if the 650 turns out to be the better fit for me for other reasons, I would try to take full advantage of it.

I do use the phone and PDA functions all day long. Mainly I store and use reference books for my work.

Any advice is very welcome, both on the GPS issue, and on the choice of 600 or 650 in the future.

Thanks,

Jeff