[HOT] Recommendations for cheap "passive GPS trackers" / vehicle mountable GPS loggers?

[Jaakko Helleranta.com]

Hi there,

There was a thread a while ago on GPS loggers but I'd have a slightly modified question on the same field:

Could someone recommend essentially GPS logger solutions that would be temporarily installed in vehicles for gathering information for preferrably a week, two or even three for every 1-2 meters the vehicle drives.

In my vocabulary (working with active tracking systems) this would be a "passive tracking system", which I don't know details for. 

The idea is/would be to find cars that are driving actively around Haiti or/and the capital area and record their tracks into GPS traces so we could verify the road network. 
A standard GPS logger with a power source (I already have a stack of 12V usb power sources) might work but option for external GPS antenna would be a plus. 

My quickish searching didn't return any concrete cases for mapping use. Tracking yes but I'd love to hear of any experience for mapping purposes. 

Any recommendations?

Thanks,
-Jaakko
http://osm.org/user/jaakkoh
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