CompeGPS is my program of choice for displaying and working with GPS tracklogs. It’s also the program we use for scoring competitions with GPS. The developers have been very active adding new features and format support to the progam, it supports a lot of different map formats.
The latest version 5.3 have a plug-in to support the newest 3D data from the US Geological Service, with a resulution of 100×100 meters. The maps cover almost the entire planet, with the notable exception of landmass north of 61° north. A lot of our flying in Norway is done above the 61° line. (Yes we have very good thermals) I have some GPTOPO30 3D data that covers all the world, but these have 1000×1000 meter resolution.
Wishlist for 2004 – Free vector based 2 and 3D maps for Norway with 10×10 meter resolution.