The Navman Fuel 3100 is a fuel computer that allows the user to monitor all aspects of fuel flow. The unit displays single- or dual-engine gasoline fuel flow, as well as fuel used, fuel remaining and elapsed time for boats powered by injected or two-stroke outboards from 50 to 300 horsepower, four-stroke outboards from 90 to 300 horsepower or inboards from 70 to 450 horsepower. Available as either a stand-alone unit or integrated into a Navman plotter or fishfinder, the Fuel 3100 can provide fuel economy and range information when connected to a GPS or paddle-wheel speed transducer. The stand-alone unit is housed in a 4.4" case with a transflective display that allows for bright-light viewing and wide viewing angles and can show data in one-inch digits. The unit has a selectable low-fuel alarm and a graphical fuel gauge to indicate remaining fuel at a glance. The Fuel 3100 sells for $349.95 for the single-engine kit and $569.95 for the dual-engine kit. Navman, Nashua, NH; (866) 628-6261; www.navman.com.