Bridge Navigation Systems: Speed Log, Echo Sounder, GPS/DGPS & BNWAS India
Seanav Marine supplies, calibrates, and services statutory bridge navigation equipment across all major Indian ports and shipyards. Our engineers service dual-axis Doppler and electromagnetic speed logs, navigation echo sounders, DGPS/GPS positioning receivers, BNWAS bridge watch alarms, and heading control autopilots (Furuno, JRC, Skipper, Sperry Marine), ensuring seamless NMEA 0183 / IEC 61162 sensor integration and immediate Class survey certification.
Supported OEM Equipment & Multi-Make Coverage
Furuno (FE-700 / FE-800, DS-80), Skipper (GDS101, EML224), JRC (JFE-380, JLN-205), Sperry Marine (Naviknot)
Technical Specifications & Operational Coverage
| Equipment Scopes | Doppler Speed Log (Water & Ground Track), Electromagnetic Log, Echo Sounder, DGPS/GPS, BNWAS, Autopilot |
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| Transducer Frequencies | 50 kHz, 200 kHz echo sounder transducers; acoustic Doppler log sensor heads; sea valve gate assemblies |
| Regulatory Standards | SOLAS V/19, IMO Res. A.224(VII), Res. MSC.74(69) (GPS), Res. MSC.128(75) (BNWAS), Res. A.824(19) (Speed Log) |
| Supported OEMs | Furuno (FE-700 / FE-800, DS-80), Skipper (GDS101, EML224), JRC (JFE-380, JLN-205), Sperry Marine (Naviknot) |
| Sensor Interfacing | IEC 61162-1 / NMEA 0183 distribution amplifiers, RS-422 serial buffers, optical isolation repeaters |
| Boarding SLA | Within 2 hours at berth; within 4 hours at outer anchorages across Indian ports |
Standard 5-Step Bridge Navigation Sensor Calibration & Compliance Protocol
Our Class-approved technicians execute this standardized procedural workflow to ensure first-time compliance with attending Class surveyors and Indian Port State Control (PSC) inspectors:
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Transducer & Bottom Sensor Impedance Testing
Check echo sounder and speed log transducer insulation resistance, acoustic crystal resonance, and verify sea chest valve integrity.
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Echo Sounder Sound Velocity & Draught Verification
Test depth readout accuracy across shallow and deep ranges; verify transducer keel-offset settings and check 12-hour history memory storage.
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Speed Log Sea-Trial Mile Calibration Run
Perform reciprocal heading calibration runs to eliminate tidal stream effects; calibrate forward/astern speed log tracking accuracy.
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BNWAS Multi-Stage Audible Alarm Escalation Check
Verify 3-12 minute dormant period timing; test Stage 1 bridge visual flashes, Stage 2 Officer cabin sounders, and Stage 3 crew alert buzzers.
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NMEA Output Distribution Audit & Class Endorsement
Validate data sentence transmission ($SDDPT, $VMVHW, $GPGGA) to VDR and radar; compile Class surveyor test records.
24/7 Port & Anchorage Attendance Across India
Seanav Marine provides rapid shore-based and offshore launch boat boarding across all 170+ Major and Minor Indian Ports, including:
Certified Equipment & Replacement Spares in Stock
Seanav Marine maintains bonded warehouse spare parts inventory across major Indian ports for immediate dispatch and installation during port calls:
Download Indian Port Entry NAVCOM & Safety Compliance Guide
Complete surveyor inspection checklist covering echo sounder draught settings, BNWAS resets, and speed log documentation.