Fish Finder 2017
This round, bobber-shaped sonar unit measures 2.6 inches in diameter and weighs 3.5 ounces. It features several different attachment points, so you can cast it from varying heights.The unit incorporates a dual-frequency transducer (90/290 kHz).
It reads depths to 130 feet and operates within 160 feet of its paired device. Deeper uses a Bluetooth connection or WiFi (depending on model) and is compatible with smartphones and tablets. Its free app comes with a fishing log, weather reports, water-temperature readout, fish icons, fishing activity calendar, and a base map.