Getac PS535E Rugged GPS PDA. Windows Mobile 5.0, with Bluetooth, an SD slot, WiFi and 2 GB internal memory storage will survive in conditions from -20C to +70C (158 F), as well as being dropped, kicked and otherwise beaten to within an inch of its miserable little life. Comforting thoughts when you’re stuck on an ice floe somewhere south of Polar Bear Pass.
A tough and reliable industrial PDA that has been built to survive, as well as work hard, the PS535E is the ideal mobile computing solution for engineering and construction, land surveying, public safety, field service, utilities, military, mapping and other outdoor/service related fields, capable of handling the relevant advanced and powerful applications within these sectors and featuring as standard Windows Mobile 5. The PS535E is also supplied as standard with integrated Bluetooth Technology and 802.11b/g WiFi capability and boasts an embedded Global Positioning System (GPS) receiver which allows users to easily collect, save and transmit data while in the field and provides fast and accurate positioning data for navigation.
The PDA may survive the -20°C temperatures, but I doubt the battery would.
My experience with batteries in sub-zero temperatures is that they don’t last very long, short of pulling them out and sticking them in your armpit every 10 minutes to warm them up.