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Northstar M121/M84 Installation and Operation Manual40
Fun symbol + depth
Normal fish symbolFun fish symbol
Fish arch + depth
23
9-5 Range
Range is the vertical depth displayed on the
Instrument sonar window. For example, if the
range is 100 m, then the sonar window shows
depths between 0 and 100 m. The range is
displayed at the bottom, right corner of a sonar
window.
The Instrument has two range modes:
Auto: The Instrument adjusts the range
automatically so that the bottom of the
water is always shown at the bottom of the
window. Auto range is recommended for
normal operation.
To set Auto mode:
1 Go to a sonar window (see section 9).
2 Press
MENU
, select Range then Auto.
Manual: The Instrument does not adjust the
range automatically. If the bottom depth is
below the range, the bottom will not appear
on the window. Manual range is useful if
the bottom depth changes rapidly, because
Auto range will cause the window to change
range frequently.
To set Manual range or to change the range:
1 Go to a sonar window (see section 9).
2 Either press
to increase range or press
to decrease range
Zoom range and offset
The sonar Zoom and Bottom windows can
show a magnified part of the range (see
sections 9-2 and 9-3).
!
WARNING
Use the Auto range when learning to use
the Instrument or when travelling at speed.