Bought a Navman F20 Europe in the Netherlands for just 99 Euros! I think these units went close to 300 EUROs two years ago. Probably it was so cheap because the product line is discontinued and the maps are from 2006. I'm probably going to buy a map update, which would be 50 EUR, so that means that for 150 EUR I have a fully up-to-date unit, still cheaper than the cheapest TomTom I've seen.
As there is a lot of bad information out there, which already has cost me 22 EUR, here some information for hackers.
You don't need to a buy a USB connectivity pack. The USB cable of any digital camera works fine. If you connect it through the USB cable, the unit will possibly even charge, but haven't tested that yet.
After you connect it, let Windows install the driver (yes, you need Windooze for this), else Service Pack 2 won't find the unit. Windows will install some Navman driver. You can now download, install and run the service pack update.
As I installed Service Pack 1 first, inadvertedly, it might be that this was the reason the navman driver was already in my system. Anyway, if you run Service Pack 2 it will update your system and possibly update the driver.
Perhaps if you didn't run the service pack before connecting the device, things might work a bit more smoothly, but in case you confused the order, just make sure to install the navman driver for the device, and then run the update.
There doesn't seem to be a way to unplug the device, so I just pulled the cable. After turning on he unit, the software was indeed updated.
UPDATE: yes, unit charges when connected to USB cable.