GPS-Racing

Another unit that might be of interest is the Locosys GT11 (SIRF II) and soon GT31 (SIRF III). These units are data loggers and have navigation capabilities as well. More importantly the 1 hz logging includes the full SiRF binary 41 data set including vertical speed. This vertical speed is calculated using doppler and is far more accurate than speed calculated from the altitude. If someone is in Melbounre Australia and wants to borrow a unit to try out, then I can spare one for you to try. I am in Edithvale. Also a plug for my software... in reference to seeing an altitude and glide graph, my software utility can show altitude in a graph against trackpoints. As long as the trackpoints are in equal time spacing then it can be used to view your glide. The software is free to use for viewing and editing trackfiles (reads NMEA and GPX) and can be downloaded from http://www.intellimass.com/RealSpeed/Index.htm.