I can't find any way to see the GPS speed readout, though it has altitude readout in real time. Can speed be read?

Bump, any explanations appreciated. Heard there was a radio Navi diagnostic mode that might do this

It can be done. You need to go into the developer menus to get the data.

I can't remember the exact key combination off the top of my head. I can get them to you later. Or someone else can post em. After you go into setup mode, click on gps and do the same key combo again. It will give you all sorts of gps information.

Jayson

Hold the Cancel + Menu+Map for 3 seconds will get you to the service menu. Next select the GPS Menu:



Next push the Menu button again for 3 seconds to get to the detail menu

Thanks