In order for a depth instrument to report depth, the boat must be located in water and the depth of the water below the transducer must be at least 3' deep. Should this condition be met, then the root cause of failure of the instrument to report depth may be rooted in the transducer, depth pod (if any), iTC-5 Analog Instrument Converter (if any), or within the instrument itself. This problem is commonly fault isolated in the field by testing the transducer with a digital transducer test set or more commonly by testing the depth instrument, depth pod (if any), or iTC-5 (if any) with a compatible instrument depth transducer which has been suspended over the side of the boat or resting atop a ZipLock bag which has filled within the water and has been positioned in the bilge (the hull must be constructed of solid fiberglass (i.e. no core material) which is less than 1" thick in the testing location. Similarly, the depht instrument, depth pod (if any), or iTC-5 (if any) may be tested with a depth sounder test set. Alternatively, the instrument display, pod, or iTC-5 may be sent to Raymarine’s Product Repair Center to be bench tested/serviced. Should the depth instrument display be able to report depth in conjunction with the test depth transducer, then the problem would be corrected by replacing the currently installed instrument depth transducer.
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