Magnetic Compass Adjustment & Deviation Card Issuance India
Seanav Marine provides certified Magnetic Compass Adjustment, compass swinging, and official Deviation Card issuance across all Indian ports and anchorages. Conducted by qualified MCA approved compass adjusters and certified specialists through our channel partner network, our technicians attend vessels off port limits (Mumbai Floating Light BFL, Kandla Roads, Cochin OPL) to eliminate coefficient errors (A, B, C, D, E) and ensure total compliance with SOLAS Chapter V Regulation 19.
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
| Service Scope | Compass Swinging, Coefficient B & C Corrector Magnet Adjustment, Quadrantal Sphere Tuning, Heeling Error Setting |
|---|---|
| Licensing & Authority | Conducted by qualified and approved Magnetic Compass Adjusters in accordance with SOLAS & Merchant Shipping Regulations |
| Regulatory Mandate | SOLAS Chapter V Reg 19.2.1, IMO Res. A.382(X), DGS Engineering Circulars on Compass Deviation |
| Swinging Locations | Mumbai Floating Light (BFL), Kandla Roads, Cochin Outer Anchorage, Chennai Roads, Sandheads Kolkata |
| Deliverables Issued | Official DGS-Compliant Deviation Card (Table & Curve of Residual Deviations) countersigned by Master |
| Turnaround Time | Compass swinging completed in 2–3 hours off port limits during safe sea transit |
7-Step Protocol for Magnetic Compass Adjustment & Deviation Card Issuance
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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Preliminary Bridge & Binnacle Examination
Inspect compass bowl for liquid bubbles, test gimbal freedom of movement, check optical periscope / reflector alignment, and verify correct positioning of Flinders bar.
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Sea Trial Coordination & Transit to Swinging Grounds
Coordinate with Master to steam vessel to sheltered swinging area with safe navigational depth off port limits (e.g., Mumbai Floating Light or Kandla Roads).
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Compass Swinging on Cardinal & Inter-Cardinal Headings
Steady vessel sequentially on 8 principal headings (N, NE, E, SE, S, SW, W, NW); compare magnetic compass heading against calibrated gyro repeater (corrected for gyro error).
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Mathematical Error Analysis (Coefficients A, B, C, D, E)
Calculate permanent and induced magnetic parameters using standard navigational deviation formulas to isolate hard-iron and soft-iron magnetism.
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Corrector Magnet & Soft-Iron Sphere Adjustment
Adjust fore-and-aft magnets (Coefficient B), athwartships magnets (Coefficient C), and soft-iron quadrantal spheres (Coefficient D) to bring deviation within allowable statutory limits (< 3 degrees).
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Vertical Heeling Error Magnet Setting
Calibrate central vertical heeling error bucket using dip needle indicator to neutralize roll-induced compass oscillations.
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Official Deviation Card Issuance & Log Endorsement
Draft official Deviation Card showing residual deviations and curve, stamped by Licensed Compass Adjuster and countersigned by Master.
For a compass swing during a call at JNPA (JNPT), see the Nhava Sheva port service guide for the details to send with your request.
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 Magnetic Compass Deviation Log & Error Sheet
Track bridge compass error daily and know exactly when statutory re-swinging is mandated.