Humminbird 596C HD DI - Manual (Page 47)

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Self Test displays results from the internal
diagnostic self test, including unit serial
number, Printed Circuit Board (PCB) serial
number, software revision, total hours of
operation, and the input voltage.
Accessory Test lists the accessories
connected to the system.
NOTE: The speed accessory will be detected only if
the paddlewheel has moved since your Fishfinder
was powered up.
Self Test Screen
Accessory Test
Start-Up Options Menu