Marine Speed Log & Navigation Echo Sounder Calibration & Transducer Service India
Seanav Marine delivers turnkey calibration, acoustic sea-valve overhaul, and transducer replacement for marine Doppler and electromagnetic speed logs and navigation echo sounders across all Indian ports. Servicing Skipper (GDS101 / EML224), Furuno (FE-800 / DS-80), and Ninglu systems, our technicians verify sound velocity calibration, keel-offset settings, and NMEA outputs to prevent bottom touch risk and Class survey deficiencies.
Supported OEM Equipment & Multi-Make Coverage
Send the equipment make and model so we can confirm the scope and parts availability.
Technical Specifications & Operational Coverage
| Log Technologies | Doppler Speed Log (Dual Axis Water/Ground Track), Electromagnetic Speed Log, Acoustic Correlation Log |
|---|---|
| Echo Sounder Scopes | Navigation Depth Sounder (50 kHz / 200 kHz), Dual Transducer Keel/Bow Arrays, Keel Clearance Monitor |
| Supported Hardware | Skipper GDS101 / GDS102 / EML224, Furuno FE-700 / FE-800 / DS-80 / DS-85, Ninglu DS2008 / DS99, JRC JFE-380 |
| Regulatory Standards | SOLAS Chapter V Reg 19.2.3, IMO Res. A.224(VII), IMO Res. A.824(19), IMO Res. MSC.74(69) |
| Transducer Gate Valves | Inspection and servicing of single-gate and double-bottom gate valve hull penetration assemblies |
| Attendance SLA | Within 2 hours at JNPT/Mumbai; 24/7 fly-away attendance across all Indian major and minor ports |
Standard 5-Step Underkeel Sensor & Transducer Calibration SOP
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 Crystal Impedance & Insulation Resistance Check
Test megger insulation resistance (>10 MOhm) on underwater transducers and verify resonant frequency response on 50/200 kHz crystals.
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Sea-Chest Gate Valve & Packless Gland Inspection
Inspect sea-valve safety locks, test gate opening/closing torque, and verify watertight integrity of hull transducer penetration.
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Echo Sounder Keel Offset & Draught Setting Verification
Calibrate transducer keel-offset against vessel actual hydrographic draft to ensure depth-below-keel alarms match chart datum.
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Doppler & Electromagnetic Speed Log Sea-Mile Calibration
Execute reciprocal navigation runs to cancel tidal vector bias; adjust speed coefficient potentiometers for 0.1-knot accuracy.
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Serial NMEA ($SDDPT, $VMVBW) Sentence Distribution Audit
Verify digital sentence broadcasting to VDR, dual ECDIS units, ARPA radars, and rudder angle telemetry systems.
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 Echo Sounder & Speed Log Surveyor Pre-Inspection Guide
Keel offset formulas, transducer impedance limits, and gate valve safety procedures for drydocks and ports.