The best GPS and fishfinder combo is Raymarine Dragonfly 5PRO, according to Fshfinders.info. This GPS and fishfinder combo has an average rating of 4.89 stars out of five, as of August 2015.
Dragonfly 5PRO is the latest product by Raymarine. It has all types of whistles and bells, such as CHIRP sonar wide-spectrum sonar technology. The technology allows the device to emit more signals into the water resulting in better details. Other features include down-vision technology that is effective at a depth of up to 160 feet, integrated Wi-Fi, and a resolution of 480 x 800. Various models of 5-inch Dragonfly series include 5M, which includes a chartplotter; 5PRO, which features GPS or fishfinder combo; and 5DVS, which is a standalone fishfinder. Other GPS and fishfinder combos include Humminbird Helix 5 SI GPS, Garmin echoMap 43dv, Lowrance Elite 4 CHIRP and Humminbird Helix 5 DI GPS.