Doug,

This is just a compass that has some dampning built in (to accomodate for wave action and such) and a countdown timer. As far as tactical stuff goes, you can tell if you are getting headed or lifted from the compass reading...but that's about it. The Race Master is much more advanced (and bigger) and although Carl brought his for the Tybee last year, we pretty much just used it as a compass (I didn't have time to study up on it - but I am pretty sure you have to teach it, through example and button clicking, your tacking and jibing angles and such).