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Page 8 491 Echo Sounder Operations Manual
4. Check that the FORMAT option is set to “490.” If not, set it
now.
Using the 491 with
the 957/958
Before starting, you should double-check that the navigator’s
AUX port is set to the Sounder option:
1. Press STAR until you reach the OPTIONS/SERVICE INFO
screen.
2. Press the PORT SETUP OPTIONS key.
3. Check that the AUX PORT option is set to “Sounder.” If
not, set it now.