I am looking for a PDA with built in GPS receiver to run "In Car"
navigation software (easiest to use).  I will also want to use it in
the hills with OS maps and at sea with Admiralty charts.  As a
secondary issue I would like to be able to use it to access the
internet, play music and store pictures.  I have been reading about
the Mio 168 with Mio Map, the Navman PiN 570 with SmartST software,
the Holux GPSmile60 and the Loox N520 with with choice of software. 
All but the Loox are old PDAs and I am wondering if I should find
something with the new Windows Mobile 5 and the new SIRFSar111.
 
Reading various user reports, I get the impression that some people
have problems with their devices and I would like to be very sure that
I have a reliable system that will perform my required functions to
the best.