I would check the power connections in between the 161’s power cable and all the way back to the battery to make sure that this is not a low voltage or low current condition. Be sure to check the fuse and fuse holder as well. Any dirty or loose connection as well as any wire that has had some of its strands broken could cause a problem like this.
If everything checks good, I would try swapping units with someone else that has a Humminbird unit to see if the problem stays with the unit or the boat.
If it stays with the unit than you need to call the folks at the Humminbird Customer Resource Center about it 1-800-633-1468.


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