What kills your time more than anything in the swim portion of a triathalon? Not swimming in a straight line to where you need to go. Unless, you’re me, then it’s not competing in the first place. Oncourse solves the first problem by putting an electronic compass and accelerometer to know where you’re going and LEDs to light up red, amber or green if you’re on course or not. Pretty simple. It works by looking where you want to go and hitting the soft button to set the destination, then swim like you mean it while keeping both lights green. You can get a pair for a $150 pledge or wait and pay $200 retail.