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NOTE: For optimum operation, the portable transducer should be adjusted so that it is parallel to the ground. For more information on this, see the earlier segment on Transducer Orientation and Fish Arches. 29 Operation KEYBOARD BASICS The unit sounds a tone when you press any key. This tells you the unit has accepted a command. Numbers in the following photos correspond to key explanations in the following pages.: 4 2 3 1 1 2 3 4 Cuda 128 and Cuda 168EX Sonars, front view, each showing screen a