This is a Polar
Stereographic chart with a Grid overlay - the grid is shown by the straight
'shaded' lines .... now look at the 0 degree meridian
- you will see that the Grid is actually aligned to this - hence the
relationship between GRID track and TRUE track is straight forward, and is
given to you by the formula given bottom right of the chart:
GRID = TRUE (+ WEST
LONGITUDE or - EAST LONGITUDE)
Now, this is actually not
really relevant to this question ..... TRACKS on this
chart are MAGNETIC if there is nothing after it (so the 353 out of VIGRA is
353M), TRUE if there is a T after it, or GRID it there is a G.
Lastly, with this grid
overlay, if you drae a straight line on this chart -
then you can see that your GRID track will not change - initial GRID track will
be the same as final GRID track.
So, what is the Grid
track out of VIGRA?? GRID doesn't change .... so simply follow PTS P .... eventually
it tells you 344G .... keep following it .... it says 344G
If you want to measure it
with your protractor, you can ...
If you want to use the
formula, you can ... 353 M, variation at VIGRA 3W, so 350T, therefore ... GRID
= 350 - 6E = 344G
This is a regular Exam
question!