WindSirf is a viewer for Speed Genie GT-31 GPS files. Puzzled? Many sailors and windsurfers use a GT-31 GPS device to record their sailing activities and then want to see how well they sailed a race course or how fast they went. This application loads on a PC and allows you to view how things went.
WindSirf is open source, FLOSS, free software, released under the GPL v3 licence for anyone to use. You will be able to read every line of code and reuse it as you wish, subject to the licence terms.
SiRF is a binary protocol from SiRF Technology Inc, and defines the way in which data is stored in the GT31 device.