NorthStar Navigation Explorer 660 - Manual (Page 21)

Northstar Explorer 660 Installation and Operation Manual 21
If Projected course is turned on, then the Explorer
660 will display the projected position based
on the course over ground (COG), speed and a
specified time. To turn Projected course on and
off and to set the time, see section 15-2.
3-5 Projected course
Boat’s projected course
Boat position
Projected position
Tracking records the boat’s position to memory at
regular intervals, which can be:
Time intervals.
Or distance intervals.
The track of where the boat has been can be
displayed on the chart. The Explorer 660 can
display one track while recording another.
To work with tracks, (see section 15-6).
The Explorer 660 can store five tracks:
Track 1 can hold up to 2000 points and is
intended to record the normal progress of
the boat.
Tracks 2, 3, 4 and 5 can hold up to 500 points
each and are intended to record sections to
be retraced accurately, for example entering a
river mouth.
Tip: Record the tracks in good conditions.
When recording is on and the track becomes full
then recording continues and the oldest points in
the track are deleted.
3-6 Tracks and tracking
The maximum length of a track depends on the
selected track interval: a small interval will give a
shorter, more detailed track and a long interval
will give a longer, less detailed track, as shown in
these examples:
Time intervals
Interval
Track 1 Track 2, 3, 4 or 5
1 sec 33 minutes 8 minutes
10 sec 5.5 hours 1.4 hours
1 min 33 hours 8 hours
Distance intervals
Interval
Track 1 Track 2, 3, 4 or 5
0.01 20 5
1 2,000 500
10 20,000 5,000
The track lengths are in the current distance units,
for example nm.