I use an Airis T620:
It is in a Ram-mount Aquabox:
currently running the new CoPilot 7 software. I've also used TomTom 6,
CoPilot 6, and OnCourse Navigator 6 (aka. Igo).
With CP7, most of the basic functions are touch-accessible even through the Aquabox cover. The rest do require removing the GPS from the box and using the stylus.
Visibility in sunlight can be a problem, particularly in the Aquabox. This is
really the biggest problem.
- A variety of software for navigation, geocaching, mapping, or whatever.
Choose the software that meets your needs!
- Pull addresses directly from your Outlook contacts list into your navigation program.
- All the other functions that a PDA can provide (email, calender, etc..)
-Must be protected in a case which hinders access.
-Visibility in sunlight
Neither of these are an issue in an automobile however! It works as good as anything else in the car.
No, it is not a Zumo, but still an alternative, depending on what you need from a device.