The Phiradar FF688C is a basic fish finder unit. In terms of features, it can be compared to the older Humminbird Piranhamax 197c. It is not a plotter unit, so it does not have GPS, charts, or other navigation features, just the dual-beam 200/83 kHz sonar. It does, however, include a transducer. Key Features and Specifications Display: 3.5" diagonal, 18-bit color range, … [Read more...] about Phiradar FF688C