Humminbird 900 Series - Manual (Page 104)

North Reference
North Reference allows you to have bearings
displayed with one of two orientations: True North or Magnetic North.
To change the North Reference setting:
1. Highlight North Reference on the Navigation main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the
North Reference setting. (True, Magnetic, Default = True)
Trolling Grid Rotation
Trolling Grid Rotation allows you to set the
orientation of the trolling grid in degrees, where a setting of 0° displays a
standard North, South, East, West alignment. See Waypoints for information
on how to set a Grid.
To change the Trolling Grid Rotation setting:
1. Highlight Trolling Grid Rotation on the Navigation main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the
Trolling Grid Rotation setting. (0° to 89°, Default = 0°)
Trackpoint Interval
Trackpoint Interval allows you to select the
time period between trackpoints. The current track can only contain up to
20,000 trackpoints, so longer time periods cause the track to extend back
further in time, but will be less detailed.
NOTE: Trackpoint Interval works in conjunction with Track Min Distance. Both
conditions must be met before a trackpoint is added to the current track.
To change the Trackpoint Interval setting:
1. Highlight Trackpoint Interval on the Navigation main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change
the Trackpoint Interval setting. (1 second, 5 seconds, 10 seconds,
15 seconds, 30 seconds or 60 seconds, Default = 1 second)
NOTE: During slow travel or drift, setting both Trackpoint Interval and Track Min
Distance to small values will allow you to increase the track resolution.
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