The DigiGuide Series of electronic compasses from AirGuide offer affordable dependability with their patented Magneto Inductive Sensor technology. Available in two models, DigiGuide 2000 and DigiGuide 2010, the compasses have a simple electronic calibration system and a magnetic distortion alarm to warn the user when magnetic interference is compromising the compasses' accuracy. The 2010 has a programmable bearing feature and a built-in clock. Both models have an O-ring seal and an adjustable bracket, as well as a large, non-glare liquid-crystal display and backlighting for nighttime use. The DigiGuide compasses sell for $39 to $59. AirGuide, Sturtevant, WI; (800) 299-2592; www.jwa.com.