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Page 24 491 Echo Sounder Operations Manual
Transducer depth
This option specifies how far below the surface of the water
the transducer is mounted. The number is added to all depths
measured by the 491 so they will refer to depth from the
surface, not from the transducer. This value should have been
set correctly during installation and should not be changed.
Changing the depth
units
You can change the depth units to feet, meters, or fathoms:
1. Press the CURSOR PAD up or down to highlight the
DEPTH UNITS option.
2. Press EDIT.
3. Press the CURSOR PAD left or right to highlight the
desired units. Press ACCEPT.
Changing the
temperature
graph’s units and
scale
You can change the highest and lowest water temperatures
that will be displayed on the temperature graph:
1. Press the CURSOR PAD up or down to highlight the line
containing the temperature scale.
2. Press EDIT.
3. Press the CURSOR PAD left or right to highlight °C or °F,
as desired, then press ACCEPT.
4. To change the endpoints of the scale, press EDIT DATA.
5. Enter the lower temperature limit using the KEYPAD.
6. Press the CURSOR PAD to the right to highlight the
upper limit and enter its value on the KEYPAD.
7. Press ACCEPT.
Number of special
waypoints
In the 961/962, the echo sounder can be set to store waypoints
automatically at the following location:
• where fish are detected by the fish alarm
• where the water temperature passes preset limits
• where fish or other echoes are marked by the user
These waypoints are automatically given names such as
*FISH##*, where ## is a waypoint sequence number that
increases to a preset limit. When this limit is reached, the
This option only
appears on the screen
if a temperature sensor
is connected.