I have a D-Air suit and I use the 2D datalogger to download GPS data to get laptimes. It's a little clunky (like a lot of professional level software) but seems pretty powerful. Anyway, one thing I have trouble with is splitting up data. This past weekend, I rode at Sonoma on Saturday and Thunderhill on Sunday. Does anyone know how to separate the data into two different files so I can analyze laps appropriately and figure out what my lap times are at each place?