3-5 Tracks and tracking
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
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
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
A
B
C
D
E
F
G
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:
AOptional data header (see section
C Destination waypoint
D Boat’s plotted course to destination
ECDI 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.
FCDI scale
GThe boat position is at the bottom, center of the display.
! WARNING
The highway window does not show land, dangerous waters or chart symbols.
24 | Northstar Explorer 657 Installation and Operation Manual |
