Q. A is N55*000*E/W and B is N54*E010*. The Average true GC is 100*. The true course of Rhumb line at point A is ?
a) 096
b) 104
c) 107
d) 100
Soln:
I feel,
Average True GC=100. This also means this is the GC track at the centre of the course which is same as Rhumb line track.
Hence at a Rhumb line track will be 100*
@KKAARR: whats the answer marked?
Q. Two positions plotted on a Polar Stereographic A 80N000E/W B 70N102W are joined by a Straight line whose highest lattitude is reached at 035W. At point B, the true course is ?
a) 230
b) 203
c) 023
d) 030
Soln:
Diagram has to be drawn, which i cannot here..
A = 80N000E/W lies on smaller circle of 80N intersecting at 000 E/W
B = 70N102W lies on bigger circle of 70N intersecting at 102W
Centre of circle is North Pole (N)
From given data: we get a triangle ANB, Angle ANB=102 (Long diff between A and B),
Required is angle NBA, which is True Course from B to A.
Highest lat=35W, a line drawn from N perpendicular
to AB at point P.
Hence Angle ANP = 35 deg.
In triangle ANP, Ang ANP=35, ang NAP=90, hence ang PAN = 180-(90+35) = 55
Now with this data, in triangle ANB, ang ANB=102, ang PAN/BAN = 55, hence ang NBA = 180-(102+55) = 023