Who's doing TSD rallies?

Just wondering if anyone has any experience with TSD (time-speed-distance) rallies?

Where have you been doing your rallies?

I immediately thought that using the odometer, a palm computer and timer, you could calculate whatever you need, even average speed. Reading up on some of the category specs, I see that you might be limited to your memory only, or scribbling TSD numbers on paper, or anything-goes. Here's the link:

http://www.rallybc.com/html/regional_rules.htm#Classes

I think you start with the simpler 'paper' (memory) class, then move up, but I don't know where a palm computer would fit in. Right now I'm stuck with no Zed, no co-driver, and no where to rally

Maybe spring will bring new hopes...