This could be wonderful.
Nowadays You may find a lot of 2 DIN integrated navi working with win ce. 5.0
(look also the potential of skinning http://xania.123.fr/content/view/487/28/).
In these devices you have already internal or external GPS antenna and BT receiver (for OBD data)
This could be very fine. I've just bought a NAVI like this for my car
Comments
Nowadays You may find a lot of 2 DIN integrated navi working with win ce. 5.0
(look also the potential of skinning http://xania.123.fr/content/view/487/28/).
In these devices you have already internal or external GPS antenna and BT receiver (for OBD data)
This could be very fine. I've just bought a NAVI like this for my car