Sonar depth finders and fish finders; radar apparatus; radios and transceivers; chart plotters; downloadable electronic maps and charts; pre-recorded electronic media featuring maps and charts; echo graphs and other technical devices and apparatus for fishing and navigation; global positioning system (GPS); GPS navigation device; ultrasonic marine depth sounders, two-way radio apparatus, navigation apparatus for boats, autopilots in the nature of electronic automatic controls for adjusting, s...