Royaltek RBT-2200 + Nokia 6233 + TrekBuddy
HTC Kaiser + OSMtracker/Mappo!/NaviPOWM

OpenStreetMap is a free editable map of the whole world. It is made by people like you.

OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth.

OpenStreetMap's hosting is kindly supported by the UCL VR Centre and bytemark.