water is constantly being churned up by tidal currents, prop-wash from other boats, etc., causing extremely densesubsurface interference. In this case a slightly increased amount of D.R.R. would be required. Remove power from theunit and disconnect the transducer.The D.R.R. LEVEL CONTROL is located on the main digital Printed Circuit Board and is accessible by removing the backplate.(See sketch)CAUTION: The DRR LEVEL CONTROL is mounted close to the rear of the case. The other larger control sets theunits depth calibration accuracy, , , , , do not adjust this control!Before making any adjustments of the D.R.R. LEVEL CONTROL make note of its factory preset position so that you caneasily return to the factory setting. It is then best to make adjustments (either increasing or decreasing DRR LEVEL asrequired) in small increments and then checking results for optimum performance in your particular area. This trial anderror approach will assure that OVERCOMPENSATION does not take place. It should be noted that it is virtuallyimpossible to arrive at one DRR Level setting that is perfect for ALL conditions. This is due to the nearly infinitecombinations of variables that affect depth finder performance.. However, the DRR system in your Aqua Probe is themost sophisticated of its type on the market today, and will provide superior performance compared to other methods ofsubsurface interference rejection.
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