Echosounder and sonar installation and service in Busan

Fishing and navigation sounders fail in a small number of predictable ways, and most of them are found at the transducer end rather than in the display head. NAVION works on single-beam and split-beam fishing echosounders, navigation sounders used for bridge watchkeeping, netsondes, searchlight and omni sonars, on vessels lying at Gamcheon fishing port, in the Yeongdo repair yards and at Busan New Port. Engineers bring test gear to the ship, so the first hour goes on proving where the fault actually sits instead of swapping parts.

Transducer installation is decided by hull form and by what the vessel can give us. A through-hull fitting in a sea chest or a flooded well is acoustically the cleanest but needs the ship dry, or the well isolated and drained. A welded blister or fairing puts the face clear of the boundary layer and clear of plating turbulence; we build the mounting and set the fore-and-aft and athwartships alignment so the beam stays vertical at working trim. Transducer cables are pulled in continuous lengths wherever the route allows, kept out of the trays carrying inverter and drive cabling, and terminated with the screen earthed at one end only.

Most "the sounder has gone weak" calls turn out to be noise, not a dead transceiver. We check for aeration and cavitation across the face at speed, cross-talk between the sounder, sonar, netsonde and Doppler log when they ping on overlapping frequencies, and electrical noise from converters, drives and shaft generators arriving through the ship's earth. Insulation resistance and impedance readings taken at the transducer plug, then again at the transceiver, separate a wet or damaged element from a cable fault or a failed output stage. A transducer reading low to hull gets replaced; it cannot be tuned back.

Commissioning sets the draft offset and sound velocity first, then gain, TVG, pulse length and ping rate for the depths the vessel actually fishes or transits. Bottom lock and bottom discrimination are tuned against a known seabed, and the range shift and depth alarm are checked so the trace is not lost when the ship rolls. Split-beam systems are calibrated with a standard target in sheltered water when the schedule and the berth allow; where they do not, we record the settings and the outstanding calibration so the next port call can take it up.

Depth is only useful once it reaches the plotter. We interface sounders to TimeZero and Olex over NMEA 0183 (DPT, DBT, DBS) or NMEA 2000, set talker and listener baud rates, confirm the sentence carries the offset the plotter expects, and check that logged seabed data is referenced to the waterline through the entered draft offset, not left as raw depth below the transducer face. Position and heading feeds into the sounder and sonar, netsonde telemetry, and network sounder links to bridge and deck repeaters are set up and demonstrated with the crew watching.

Failed transducers, transceivers, cables and displays are supplied from stock or ordered in, and we will quote a like-for-like replacement or a change of make where the existing mounting and cable run can be reused. On completion the settings, wiring changes and the readings taken are handed over in writing, so the next engineer to open the unit is not starting from nothing.