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map3 is a very lightweight mapping program, I wrote it because I was going to take a trip in a car with someone who is never wrong and was going to map read [because the person in the car who _is_ always right gets car sick, and I'm dyslexic and don't know left from right] So I got an inverter, a small laptop with a big disk a small GPS receiver with a magnetic antenna and a map dataset. It worked very well and on the one occasion we did get lost it told us exactly where we were.

map3 is written entirely in C and can handle Irish and british grids [they disagree about which way north is and how long a meter is]. It's very efficient it caches images itself and renders directly to the screen using Xlib calls, it can handle 16,24 and 32 bit displays. If you want 8 bit you'll need to use gis instead.

Files for the project are avaiable here.

and here's a screenshot, again the map has been blurred due to lawyers.