The depth reading on the rear unit starts flashing, when you start to plain out. Rough water causes the same problem. Unit will also shut itself off. I have been dealing with this issue for several months. The dealer has tried everything, moving transducer, replacing unit etc.. Still the same issues, I do not like Garmin products for marine craft, and would not recommend to anyone. Glad mine was under warranty, got money back from dealer, got (2) Hummingbird 898si. Thanks BucksIsland Marine. Southside, AL
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Wow.. where to start.. there are so many things that will cause the issue you are describing.What type of electronics do you have? Does this happen at all speeds? Where is the transducer mounted? I need more info about when it stops reading.
1.Wrong setting on the unit
2 Bad transducer
3 Bad transducer mounting (either inside the hull or outside the hull.)
4. (In hull) Turbulence going under the boat (mine quits reading at about 55 mph @ half trim...the boat is lifting so much it causes air pockets so the transducer loses contact with the water)
5. (Outside hull) Turbulence around the bottom of the boat where the transducer meets the water.
Good luck,, when you get the info.. reply to me..
I believe I'd start troubleshooting with the power supply. Disconnect and clean the cable ends with Fluid Film (I swear by this stuff) Check the crimps and make sure they're not loose. Pay special attention to the ground connection.
With your temp not reading correctly in addition to your depth rolling, this usually indicates a common fault. (Usually ground.)
Check the data cable and socket on the control head for corrosion (again, Fluid Film is your friend) If that doesn't fix your problem, then a "hard boot" or reset of your system might solve the problem(s).
First, make sure that the connection is good, clean, and tight on both ends of your transducer. Sometimes turbulance or temperature stratifications in the subsurface water will cause this. Also, check the specifications of your transducer. Some do not perform well while moving at high speed. One test, when on plane, when the problem occurs, slow the boat and see what happens to the readout. Repeat this several times. This should help narrow down what is causing the problem.
If the transducer is out of the water, you will not get a reading and see the flashing depth. You should hear and feel the clicking in the transducer when out of the water and working properly. Are you getting a temp reading when out of the water?
A test bucket wont work, A 200 khz transducer will generally not work in anything less than 2' of water, due to surface clutter. If the transducer is working, you should hear it make a ticking sound.
When you got the 17000 foot reading was your range set to auto?
How is the transducer situated on the boat? Sometimes turbulence and bubbles from the hull can cause erroneous readings, including unrealistic depths, or no depth at all. Stop the boat and turn off the engin e and anything electrical to see if problem repeats itself. If it only crops up when the boat is moving then it is most likely the transducer location.