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Northstar Explorer 657 Installation and Operation Manual38
8-5 Range
Range is the vertical depth displayed on the 657
sonar display. For example, if the range is 100 m,
then the sonar display shows depths between 0
and 100 m. The range is displayed at the bottom,
right corner of a sonar display.
The 657 has two range modes:
Auto: The 657 adjusts the range automatically
so that the bottom of the water is always
shown at the bottom of the display. Auto
range is recommended for normal operation.
To set Auto mode:
1 Go to a sonar display (see section 9).
2 Press
, select Range and select
Auto.
Manual: The 657 does not adjust the range
automatically. If the bottom depth is below
the range, the bottom will not appear on
the display. Manual range is useful if the
bottom depth changes rapidly, because Auto
range will cause the display to change range
frequently.
To set Manual range or to change the range:
1 Go to a sonar display (see section 9).
2 Either press
to increase range or
press to decrease range
!
WARNING
Use the Auto range when learning to use the
657 or when travelling at speed.
Zoom range and offset
The sonar Zoom and Bottom displays can show
a magnified part of the range (see sections 9-2
and 9-3).