BOTTOM LINE UP FRONT (BLUF)
Seanav Marine delivers 24/7 emergency attendance, annual calibration, and sea-valve transducer servicing for commercial marine speed logs across JNPA (Nhava Sheva), Mumbai Port, Mundra, Kandla, Chennai, Visakhapatnam, and Kochi Port. We service Furuno (DS-80/DS-85), Sperry Marine (Naviknot), Yokogawa (EML500/900), JRC (JLN-205/652), and Skipper systems, resolving erratic speed readings, gate valve leaks, and NMEA distribution errors to ARPA, ECDIS, and VDR.
Commercial Speed Log Maintenance & Sea-Valve Operations
SOLAS Chapter V Regulation 19 mandates speed and distance measuring equipment (SDME) indicating speed through the water (STW) for all ships of 300 GT upwards. Inboard diverless sensor withdrawal through vessel sea-valves permits safe replacement while berthed at JNPA (Nhava Sheva), Mumbai Port, Mundra, Kandla, Chennai, Visakhapatnam, and Kochi Port.
Sea-Valve Sensor Changeout
Safe inboard extraction and replacement of acoustic Doppler and EM sensors through gate valves without drydocking.
STW Calibration & Error Alignment
Correction of boundary layer flow errors and marine biofouling compensation factors to ensure ARPA collision vector accuracy.
ARPA, ECDIS & VDR Interfacing
Testing 200 pulses/NM closures and isolated RS-422 NMEA 0183 ($VMVBW) output lines.
Preamplifier Overhaul
Component-level repair of junction box preamplifiers, 200/440 kHz oscillator boards, and power supplies.
Request Speed Log Engineer in India
24/7 technical dispatch across all berths and anchorages in India.