Hi Timbo,

I get lat/long data every second. With that you can calculate a lot of useful information. Right now I have 24 different metrics that I look at. Time on tack, time tacking, mark rounding time, speed on tack/gybes, various parts of the course, etc.

I found out, for example, that tacks to port were a real time killer for me. Specifically, my time to accerate after the tack. Over vacation, I must have done 50-75 port tacks and now I look at the data and I have improved my time on that metric about 33%.

Agreed its not all about the math, but the math can help identify and quantify some of the things the good skipper did compared to everyone who finished behind him/her.

BTW, I use a SpeedPuck. I like the big readout and some of the features, but too expensive. You can get 90% of the real value from these other units being discussed. Gathering lat/long every second as opposed to larger increments is very important for accuracy.