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The Speed Sensor is compatible with many Humminbird fishfinders, and provides digital readings of speed through water, and activates the triplog feature that shows time, distance and average speed. Readings are from 0 to 70 mph. 20ft cable and hardware included. This sensor works with Matrix 10, 15, 17, 20, 25, 27, 55, 65, 67, 77c, 87c, 97; Piranha 1**, 2**, 3*, 4*, 5*; PiranhaMAX 210*, 215*, 220*, 230pt*; Fishfinder 515, 525, 535, 565, 580, 585c, 595c; 931c, 937c; 323, 343c, 363, 383c; 717, 727, 747c, 757c, 767, 777c, 787c; 917c, 931c DF, 937c DF, 937 DF2, 957c. 967c 3D, 947c 3D; Matrix 47 3D, 981c SI, 987c SI. Matrix 35, 37; 737; 575. Optional:(Matrix 67, 87c, 97; 727, 737, 747c, 757c, 767, 777c, 787c) 797c SI, Wide One Hundred, 128,100SX, Wide One Hundred, 128,100SX, 200DX, NS25** HDR600**, HDR200** Proflasher**, Wide W, LCR W, 405SX, Legend 1000, 2000, 997c SI.
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