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Using the 491 with the 957/958
4.Check that the FORMAT option is set to “490.” If not, set it now.
Before starting, you should
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.
Page 8 | 491 Echo Sounder Operations Manual |