Today, the CombinationGPSChartplotter/Fishfinder is the most popular form of combined electronics. Consumers have a nearly limitless supply of units available in monochrome or color, with screen sizes as small as 3.5" up to a massive 12.1" screen, and a wide variety of sonar power and frequency combinations, including multi-frequency machines with up to 1,000 watts of power.
Good plotters might not be the best fishfinders and vice versa.