8X Chart Drawing Triangle Ruler for Ship Drawing 300mm Large-Scale Triangle Ruler

Determine longitude on protractor to determine course or bearing
The protractor's allows placing a dividing point or pencil on a point of the hole
A string can be used to fix the stopwatch used on the hole for a long distance of course.
When charting, it is used to draw the bearing line or heading line, and measure the bearing line or heading degree.

colour:Transparent
Material:plastic
size:300mm

Package Contents:
8 x Nautical chart drawing triangle ruler

Only the above package content, other products are not included.
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.