How do i trouble shoot a hummingbird HDR 600 it show 1.5 ft after a few seconds of being turned on, the first few seconds it reads fine. the Transducer is bronze and installed thru the hull.

SOURCE: Marine Faria depth finder, with thru the hull transducer.

I'm having the exact same problem. I spoke with the service manager at Faria (Ted) and he was thinking that as long as the gauge is showing a reading, it should default to reading the depth. I'll probably send the guage in to FARIA - they'll repair it for $55. You bring up a good point - maybe the transducer is bad? I put a call in to the Tedmeister to see what he thinks. I'll post if he sheds any light.

SOURCE: Not getting correct readings from

you need to mount it or stop it lifting off the hull tthen move with it sucured

SOURCE: I have an old Marinetek

Unfortunatly that transducer will not work on the new unit. The sonar sensor is not compatible with this transducer and I would doubt it would even match up to the plug in the Garmin. These units are very propriatory and you will have to use the transducer that came with the machine or one that was specifically designed for the sonar unit. The transducer for your newer unit should be able to mount flush on the hull without having to pull your boat out of the water. These newer units have the capability to see through the hull without having to mount them externally.