Contemplating buy a new GPS....advice please

Thanks Oldplodder....that'll teach me to search first :-). Seems you answered everything. Re the external antenna..have you tried using one yet?

Glad you found the thread.
Saved me cutting and pasting it. :-)

No, not yet to the aerial.
Have not needed too.

Have been to some areas which are pretty tree covered which supposed to be a problem, but everything worked OK.

Have used it in a plane, and here in the office.
Find if I hold it near a window (even in a plane at 10,000m), it finds a few satellites and is off and running.
As a side note, if in a plane it seems to make a few people nervous when you mention a few times to your wife in the next seat that we are at 10,323m and travelling at 854km/hr. You get some strange looks too. But it was good fun tracking the plane, better than watching a video. She had the window seat and all was working well in the next seat over.

Also, slower PDA's have a LOT of trouble reading big SD cards (like 1 gig and above) and mine has 5 gig on board. The Ipaq HW4700 does a great job but the old 205 mHz jobbie cacked itself with a 1 gig SD card in it