| The Bi-Rola is a Rolling
Protractor with a Twist!
Not only does it roll fore and
aft on a smooth-operating roller, but by tilting it slightly,
you can also roll it from side to side. This allows a course
line to be moved anywhere on the chart's surface with ease.
- Removable protractor arm
measures in True or Magnetic
- Protractor markings, Loran
interpolator scales
- 200mm ruler, a
speed/time/distance table built in
With this device and a pair of
dividers, you have a complete plotting package.
- Made from Lexan
- Practically indestructible
- 13 7/8'' x 2 5/8''
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