This New Kane Dead Reckoning Computer for pilots is used for calculating Time, ground/air speed and distance problems Fuel consumption Altimeter and airspeed corrections (for atmospheric pressure and temperature variations) Airspeed corrections Density altitude Drift correction (if you find yourself off course) Conversions (the flying world uses a confusing plethora of units - nautical miles, knots, km, U.S gallons, Imperial gallons, litres, feet, pounds, kg) Wind and plane velocity vector problems (hence the name "dead reckoning") It is an essential device for the private pilot to use when flying. It is Brand New in the factory sleeve and has only been taken out of the sleeve to show people who are interested. I know they sell for a lot of money when new and this will be very useful at a very reasonable price. Only $20 for it with the fitted sleeve. Not a mark on it anywhere. If you can use it or have a friend who flies, then this would make a terrific gift. Does not require batteries. I'm retired and available most of the time from 9 am until 7 pm if you wish to see it. Call me by voice phone or email me to set a time to come over. 613-226-7873