Garmin depth sounder

[asahi]

I have a a Garmin GPSmap 188C screen that shows depth reading but the screen is now shot and I can now only see big black spots. I’ve traced a cable from the Garmin screen to a device that’s going through the hull (photo attached), so I’m assuming this is the depth sounding module.

My question what screens might work with the thru-hull sounder. Would something like the garmin handheld fishfinder work?

[Pete7]

The easiest solution would be to replace the GPSMap which are available second hand. However, they are getting on a bit now and don't show AIS if that is important to you. Good little GPS sounder units, had one on a rib in an exposed position for years in the early 2000s. You will need the 'c' version if you want colour.

https://www.ebay.co.uk/itm/GARMIN-GP...IAAOSw7PFdZCPO

[asahi]

AIS or color isn’t important to me. Based on your response, if I want to find a different (ie simpler) screen, then I’d have to install a new transducer, is that right?

[Lake-Effect]

Originally Posted by asahi

AIS or color isn’t important to me. Based on your response, if I want to find a different (ie simpler) screen, then I’d have to install a new transducer, is that right?

I went through this last year when our Raymarine ST60 depth instrument started malfunctioning. Repair could cost at least $100 plus shipping, just replacing the head or transducer would be ~$200+.

For CDN$140 I bought a complete new Garmin Striker 4 fishfinder with transducer, and modified a $10 PVC octagon box as a transducer tank to shoot through the hull. Works great. Colour display, built-in GPS for storing waypoints, and displays speed over ground.