Navigator Activity Badge: water option
Alternative C - water
-
Have a good working knowledge of charts, chart
datum and symbols used.
-
Display an aptitude in compass work by
completing the following three activities:
-
Read a mariner's compass marked in points
and degrees and have knowledge of compasses generally.
-
Know
about variation and avoiding deviation. Be able to correct a magnetic
compass course for variation and deviation to obtain a true bearing.
Given a true bearing, successfully adjust this to obtain a compass
course.
-
Understand how compass error can be found
from a transit bearing.
-
Read a mariner's compass marked in points
and degrees and have knowledge of compasses generally.
-
Complete two of the following:
-
Understand how a position may be found
from two intersecting position lines.
-
Understand what is meant by a 'cocked hat'
position and how to use it safely. Plot a position from any three cross
bearings
-
Plot a position using the 'running fix'
method.
-
Plot a position using a combination of
compass bearings and any one or more of the following:
-
satellite navigation system
-
vertical sextant angle
-
horizontal sextant angle
-
line of soundings
-
transits
-
satellite navigation system
-
Understand how a position may be found
from two intersecting position lines.
-
Be able to use tide tables and tidal stream
atlases.
-
Understand the use of the marine log to obtain
distance run and speed.
-
Understand the buoyage system for United Kingdom
coastal waters and other methods of marking dangers and channels.
-
Demonstrate
your awareness of the latest developments in electronic technology such
as the Global Positioning System and electronic charts.
-
Undertake
a coastal voyage of between four and six hours acting as navigator. A
log should be kept showing courses steered, distance run, navigation
marks passed and weather experienced. During the voyage:
-
Plot the estimated position every hour by
keeping up the dead reckoning.
-
Whenever appropriate, and not less than
once per hour, plot an observed position by bearings or other means of
obtaining a fix.
-
Plot the estimated position every hour by
keeping up the dead reckoning.
Notes
-
The voyage should be planned on the chart beforehand using tidal
streams to the best advantage and giving hourly courses to steer for an
assumed speed.