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1. OPERATIONAL OVERVIEW
1-19
Ship’s speed dependent mode
With speed data provided by a speed log, current indicator or navigation
equipment, the display advance speed may be set according to ship’s speed, the
ship’s speed dependent mode. As shown in the figure below the horizontal scale
of the display is not influenced by the change of ship’s speed, thus the
speed-dependent picture advance permits judgment of fish school size and
abundance at any speed. The picture advance speed indication is suffixed with
an “S” when the ship’s speed dependent mode is active. For example, “1/1S.”
This function is available with ship’s speed of 2-20 kt. You can use the ship’s
speed dependent mode by setting PRR LEVEL to “S” on the TX/RX menu. For
further details, see PRR LEVEL on page 2-8.
FULL SPEED HALF SPEED
Actual Movement
Same size
fish schools
Speed
Normal Mode
Ship's Speed Dependent Mode
Fish school is shrunk at high
ship's speed; expanded at
low ship's speed.
Fish schools are shown
same size regardless of
ship's speed.
How the ship’s speed dependent mode works