Anyone tried the Nike Sportswatch+ GPS?
It doesnt have a countdown timer but it is very compact, has good batterylife, and would be perfect for reviewing how you sailed at the end of the day.
The laptimer might be fun as well, I wonder if you would work when sailing an windward/leeward course.
http://nikerunning.nike.com/nikeos/p/nikeplus/en_GB/products/sportwatch_pdp?pid=409503