On a cruise anything can go wrong, and everything eventually does. Don't stress out about it-prepare. Plan fuel stops on your route with the FloScan 9000 series. When connected to your GPS, the FloScan 9000 calculates miles per gallon. It also calculates total fuel consumed, gallons per hour, and engine hours and rpm, and it displays all functions on a backlit LCD screen. The series operates with single and twin outboards, stern drives, and inboard gasoline engines from 50 to 1,000 hp, and single diesel engines from 80 to 3,000 bhp. The twin gas model includes an engine synchronizer indicator that displays in a bar graph the differences in engine rpm. Price: $945 to $1,574. Contact FloScan at 800/522-3610, www.floscan.com.