Self Test; Accessory Test - Humminbird 900 Series Installation And Operation Manual

Self Test

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.
Self Test Screen

Accessory Test

Accessory Test lists the accessories connected to the system.
NOTE: The speed accessory will be detected only if the paddlewheel has moved
since your 900 Series™ was powered up.
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Accessory Test Screen