If you have used the Zeus Serial Data Logger then you may want to play the data back. Here are 3 programs to let you do so.
Source
This program will play GPS recorded data in a window. Zeus Pro Only.
This program will play GPS recorded data to the console. Zeus Pro Only.
This program will display generic recorded data to the console. All Versions.
Simulation Data 45K Zipped
Don't have a GPS or need a large set of GPS data for testing? This simulation data simulates a GPS moving at 25mph in a triangle format. It is about 24 minutes of data. Use it with the above programs. Note the name of the file is LogDataSim.txt