Play
Start
Place the edge of the
Breton Plotter along the
course. The Course arrow
goes from start R "4"
towards the entrance.
Turn the protractor to align
it with the chart vertical
(longitude) or horizontial
(latitude) lines.
Read the angle along the
0 deg. Direction Of Bearing
The Course is 53 deg True.
What is it in Magnetic deg.?
First find the Variation.
Observe the compass rose
What is the true course
from R "4" Fl R 4s to the
entrance buoys to
New London Harbor?
The Variation is 14 deg W
The Magnetic course
is 67 deg M
Now apply 14 deg West
to the Breton Plotter
= 53 deg T
This is also equivalent to
53 deg T + 14 deg Var
= 67 deg M