Navigational Charts
Paper navigational charts are used with a
parallel ruler, dividers and a pencil. Charts are an essential navigational tool, and are especially useful
when you need to plot a course for a longer trip.
Charts show depths, hazards, land and
deviation figures for the area you are navigating.
Even if you have electronic chart software
on your vessel, keep in the habit of using the paper charts. Then if a power failure or a power spike
causes the computer to fail you will still have access to the information.
Compass
It
is good practice to get into the habit of using the magnetic compass. It helps to:
- Confirm electronic devices are operating correctly.
- Show less experienced watch-keepers the true
position of hazards on charts, when they calculate deviation and variation corrected headings.
- Ensure that watch-keepers can perform their duties if
GPS and Radar fail.
- Break the monotony of the watch.
Radar
The radar set on your vessel is critical when
visibility is poor (for example in poor weather, fog or at night). The radar will
also often be the first indicator that there is something small ahead.
The watch-keeper must keep an eye on the
radar set at all times. Small objects or vessels can appear on the radar very
quickly. The time between the radar
detecting something, and the vessel colliding with that thing can also be very
short.
Radars need to be checked regularly. Radars do get out of sync and may need to be calibrated
to give accurate readings. You can check
radar accuracy by cross checking against visual fixing and GPS.
Key points when using the radar:
- ensure the Range
is set correctly for the operation you are performing and the associated
hazards in the area.
- make sure the Gain
and Clutter settings are set
appropriately for the weather conditions you are working in.
- remember the magnetron in your radar has a finite
life and the radar’s performance will deteriorate so it is important that you
have it checked and serviced regularly.
Navigation
Lighting
The glow from your vessel’s navigational
lights shows others where you are and what you are doing. At night, in fog, or
in adverse weather, the lights will be the first warning other vessels may have
of your presence. Navigation lights also
help other vessels to figure out your vessels’ approximate course and indicate if
you are fishing or towing to an adjacent vessel.
Lights must be well maintained and correctly
operated.
- Always turn the appropriate lights on and off.
- Remember to turn your fishing lights on and off.
- Always run a quick visual check that the lights are
shining after you have turned them on (you should do this even if you have an
alarm fitted).
Shapes
Shapes are used during daylight. They show that your vessel is performing a
specific task such as fishing. This
indicates to other vessels that your manoeuvrability may be restricted and they
should give you plenty of room. The
shapes on other vessels tell you what they are doing. Using shapes is an important safety practice.
The watch-keepers eyes and ears
Your eyes and ears are the most valuable
navigational aids you have. Even though
you may have good and reliable technology, what you see and hear at sea is very
important.
- Keep background noise in the bridge to a minimum
(i.e. stereos, CDs).
- Have the maritime radio on, and listen to it.
- Regularly put your head outside to look out and
listen.
- Listen for changes of sound.
Weather Faxes and Broadcasts
These provide valuable information about the
environment. Get into a routine of using
or listening to them.
Depth sounders
In shallower waters the depth sounder gives
useful information that you can compare with the charts. It helps to clarify position as well as warn
of an immediate danger of grounding.
Global
Positioning System (GPS)
Most
vessels have a GPS on board now. GPS is
a useful tool, but it must not be used as the sole navigational tool.
Remember:
- GPS can become inaccurate due to electronic or
satellite malfunctions.
- GPS does not show other vessels’ positions or warn
of an imminent collision.
- GPS does not show the vessel’s position relative to
adjacent shoreline.
- You have other navigational aids you can use.
Version 1.0. Last updated 27 June 2006.