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Northstar Explorer 657 Installation and Operation Manual24
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 657 can display one
track while recording another.
To work with tracks, see section 17-6.
The 657 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 a reference tracks and then use
the track to help navigate the same trip later.
For example, record a reference track as you
leave harbour. Then if you return to harbour and
visibility is poor, select the chart and navigate
manually along the reference track back into
3-5 Tracks and tracking
the harbour. Record reference 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. 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.
4 Navigation: Highway window
The highway window has a bird’s eye view of the
boat’s course to a destination:
To go to the highway window, press
,
select More, then select Highway.
The highway window shows:
A Optional data header (see section 2-7-3)
B Optional compass (see section 2-7-4)
C Destination waypoint
D Boat’s plotted course to destination
E CDI lines, parallel to the boat’s plotted course
(see Appendix C, CDI). The CDI lines are like a
highway over the water where the boat will
move.
F CDI scale
G The boat position is at the bottom, center of
the display.
!
WARNING
The highway window does not show land,
dangerous waters or chart symbols.
A
B
G
F
C
D
E