Can't help with the other two Qs, but re GPS maps:
Just had to re-install all my GPS stuff on a new computer so just done this task myself.
Olaf's site has an exectuable file (the top one of the download links I think) that, once run, creates tiles of the map that drop straight into the Gamin Mapsource software (that you get free with the GPS unit) so its a piece of cake to set up.
If you want to take a gps map with you, i can't recommend this one highly enough. I tried planning a route on it while back home, but it was just as easy to be riding along a road while there, see a fun looking track, check where it went on the gps map and just decide to head off. Brilliant.
Have a good time!