Apparatus and instruments for mapping, namely, electronic sensors and receivers as basis for mapping through satellite measuring and satellite photographing; apparatus and instruments for nautical mapping, namely, sonar equipment, echo sounding devices, magnetic measuring equipment for nautical mapping, namely, magnetic gyrocompasses; apparatus, instruments, systems and equipment for electronic positioning, namely, electronic navigation instruments, namely, global positioning systems (GPS), low frequency radio navigation device (LORAN-C) receivers, acoustic transducers; apparatus and instruments to determine position, namely, emergency position-indicating radio beacons, GPS tracking systems, radars; apparatus and instruments for navigation of ocean-going vessels, namely, GPS navigation device and instruments, radars, and auto pilot systems, comprised of computers, computer software transmitters, receivers and network interface devices; electronic control systems for sonar acoustic sound wave machines; electronic navigational apparatus and devices for use in positioning or measuring the location of vessels, namely, differential, absolute and relative positioning systems (DARPS), differential positioning systems (DPS), relative positioning systems, and electronic control systems for use with vessel thrusters and rudders; hydroacoustic monitoring systems for underwater structures