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Labeling the Course Line
Procedure
Figure 8-10 shows a typical layout and labeling of course lines. The
label for direction is the letter C followed by three digits indicating true
course in degrees; this is placed above the course line. If course lines
are based on magnetic headings, the letter M is added following the
digits.
Figure 8-10. Labeled course line.
The intended speed, or the speed you wish to make good with respect to
Earth, is known as speed of advance, or simply SOA. SOA is also used
to designate the average speed that must be made good to arrive at a
destination at a specified time. The letter S followed by numbers shows
the intended speed. This is placed below the course line, usually
directly beneath the direction label.
Emergency
Plotting
There are times when you will be required to plot positions in
emergency situations.
The most common of these is during man
overboard events. Your reaction time is critical. The preferred method
is to use the WRN-6 to enter a waypoint and then drive the ship back to
that point. You may also use this method using commercial Loran C
receivers.
You must consult the WRN-6 or Loran C operators manuals
for step by step instructions.
Leading Petty Officers: Post detailed man overboard procedures at the
chart table on the bridge. Hold training frequently on procedures, strive
to obtain fix data within 3 seconds from sounding man overboard alarm.
8-17
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