This is a great gift and a must have for the navigator! Map Wheel by Scalex quickly, easily measures distances on any chart or map of any scale, even over roundabout winding courses of travel. Simply select a scale to match the map or chart and roll the wheel on the map to read the measurement.
- Accurate, digital readouts in miles, kilometers, and nautical miles.
- User may select from 19 built-in scales, manually enter any scale, or derive a scale by measuring between two points on the map or chart separated by a known distance, when the scale is unknown.
- "Counter" and "adder" buttons on probe tip allow you to count stops or attractions, or add distances as you go.
- Clear audible tone indicates wheel movement.
- Automatic shut-off.
- Uses two AAA batteries (included in package).
- For your personal use or makes a great gift.