Chapter 4: AdditionalBasic Functions
43
using Track
Histories
Placing and Deleting an Event
The procedure for placing an event is the same as for placing a mark, except that
you use the
EVENT
key and the event is always placed at the vessel’s position.
The event is marked with an event name in addition to the event symbol.
If the date, time, sea temperature and depth are available they are recorded with
the event.
The procedure for deleting an event is the same as for deleting a mark, except
that, since events are special waypoints, you are prompted to confirm the
deletion.
4.3 Using Track Histories
The chartplotter
TRACKS
function allows you to mark on the chart the actual
route that your vessel has followed, as if it had left a visible fixed wake.
While the track is turned on, it is recorded in the chartplotter’s memory, and can
be retrieved and displayed later if required. For example, you may wish to
display a previous track, and then use the Route option to place waypoints along
it that you can follow the same route again.
Caution:
In confined waterways, if you place waypoints onto a track you should be
aware of GPS accuracy limitations.
You can store up to 5000 track points in total, in up to 5 track files. The
chartplotter issues a warning when 4000 points have been stored. Up to 5 track
history files, including the current track, can be displayed on screen at one time.
The track files stored in memory can be downloaded to a Memory C-Card (see
Chapter 6). C-Card files can be retrieved for display at a later date.
The length of track that can be displayed is limited by the frequency of the track
points. The more frequent the track points, the more accurate the track recorded,
but the more memory is required. If you wish to display and record a long track,
you may need to increase the gap (interval) between points. Once the memory is
full, track points will start to disappear from the beginning of the track. The
chartplotter allows you to specify the track interval, in terms of either distance
or time.
You can check the number of track points recorded for each track file, by
displaying the Tracks Edit window as described below.
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