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The Humminbird (334/687-0503; humminbird.com) 987c's most striking feature is its wide, high-resolution color display, but there are other attractions inside. Dual microprocessors deliver fast, full-screen sonar and mapping updates, and help the triple-channel sonar transmitter/receiver manage four operating frequencies. The unit can look down with 200 kHz, 50 kHz or both, and it can scan to each side with 455 kHz for the best detail or 262 kHz for a longer reach.
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A simple, two-stage menu allows users to manage everything. Experienced users can select an advanced operating mode for increased manual control of most of the features. Three neat, programmable "radio button" keys are a stand-out feature. Once programmed, a single touch of each button brings up a custom screen view incorporating a user-selected combination of features and adjustments.
NUTS AND BOLTS
Installation was straightforward, and we especially liked the new plug that groups all the power, transducer and sensor wires into a single connector that can't be installed incorrectly, even in the dark.
The large transducer has as much bottom surface area as some trim tabs, and it acted like one on our aluminum ...