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Built for fishing in large lakes or reservoirs, the Humminbird GPS receiver offers a compact, accessory-rich solution for anglers of all types and experience levels in a wristwatch-like design. The Humminbird SmartCast RF-30 allows users to look at the bottom virtually, giving an awareness of depth and underwater objects that allows anglers to keep lures in optimal zones for a catch without the risk of getting their lines tangled. This GPS navigation device offers a 1.25-inch 48x32 resolution screen that accurately displays fish types, locations, and depth. Navigation between menus with fish depth ranges, alarms, and identification icons is quick and easy with the Humminbird GPS receiver and its one-touch keypad system. The Humminbird SmartCast RF-30 has an operating range of up to 75 feet, and it can accurately depict underwater objects down to 100 feet with the integrated Remote Sonar Sensor. Waterproof with Wet Switch technology options, the GPS navigation device saves battery life even as it is being used for up to 400 hours of in-water operation. User-friendly and convenient, the Humminbird GPS receiver requires a minimum of space to operate at full functionality while remaining portable and effective for anglers on the go.