there is a diy option in the #zipit irc channel ask hinv about buying one. http://mozzwald.com/zipitz2 got little pspmaps and navit working on it. hardware struggles with non-local route planning. pspmaps uses google for getting a route plan, so with wifi (non-free firmware or use free usb one.) you can get a route plan more easily. you need a serial or usb gps. i have goodie packs for adaptors and bits i can sell for at cost.
other wise your options.... maybe Chip handheld can be turning into a free gps (there software stack as unnecessary non-free bits which have free replacements.). wait for eoma-68 handheld little device, going to be ages for that, but i look forward to the day. :) wait for a http://pyra-handheld.com/ . loads of little bits of non-free firmware but at least the cpu is free unlike intel. on GPD pocket mini laptop, nonfree wifi,bt,cpu but available for £280~ i forget the flash sale price https://www.gearbest.com/tablet-pcs/pp_613003.html?wid=21 install ubuntu and config navit + bluetooth gps which is a bit fiddly but works or use usb one.
