Marine electronics refers to electronics devices designed and classed for use in the marine environment, the majority of these types of devices are either water resistant or waterproof.
Chartplotter / Ecosounders
A Chartplotter is a device used in marine navigation that integrates GPS data with an electronic navigational chart. (ENC)
The chartplotter displays the ENC along with the position, heading and speed of the ship, and may display additional information from radar, automatic information systems (AIS) or other sensors as echo sounder.
Echo sounding is a type of SONAR used to determine the depth of water by transmitting sound pulses into water and locate fish underwater by detecting reflected pulses