I've had a Mio P350 for a while and have not been able to get it to talk to mSeeYou.
Anyone know which port settings to use?
I've just bought a Fujitsu Siemens Loox N560. This not only has a handy satellite viewer but also worked with mSeeYou without issue. Given that it comes with a 3000mAmp battery and kept 6-8 satellite fixes even in the car while driving back today (with only an internal aerial) I'm very impressed so far.
Judging by the battery usage on an 1.5 hour drive, I would estimate it will give between 8 and 10 hours use even with the backlight on (medium brightness setting).
Looking forward to some better weather so I can try it for real...

Cheers Neil