North Reference; Trolling Grid Rotation; Trackpoint Interval - Humminbird 1157c Combo Installating And Operation Manual

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)
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°)
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.

North Reference

North Reference allows you to have bearings displayed with one of
two orientations: True North or Magnetic North.

Trolling Grid Rotation

Trolling Grid Rotation allows you to set the orientation of the trolling

Trackpoint Interval

Trackpoint Interval allows you to select the time period between
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