The GPS receiver, which has 48 channels, is exact. For enhanced precision and less pointer bounce during operation, data is displayed using an analog pointer powered by a digital stepper motor. The Chesapeake Series features a polished stainless steel bezel, domed glass lens, and a premium LED back-lit dial. Requires 3-3/8" hole. WARNING: CA PROPOSITION 65 Key features: Rugged, reliable construction The LCD shows the Compass Rose heading as well as the actual direction (COG) One second from Hot Start for fast satellite acquisition time (TTFF). +/- 1 MPH accuracy in a speed Pointers powered by digital stepper motors Perfect for slow-moving arteries when pitot tubes are ineffective. Ideal substitute for speed sensor equipment that can fail over time (pitot tube and paddle wheel). Specifications: Brand: Faria Manufacturer?: Faria Manufacturer's Part Number: F33749 Product Package Dimensions: 6.0 H x 5.3 L x 5.0 W (inches) Model: 33749 Product Dimensions: ?6" x 5" x 5" OEM Part Number?732486