Coefficient change due to change in latitude Coefficient:Maximum coefficient is caused by one or more ship’s force.Maximum coefficient is caused by permanent Magnetism+induced magnetism.Coefficient is measured in degrees.Coefficient is not a force but produced from force. Coefficient B, C – change with change in latitude.Coefficient A, D, E – don’t change with change in latitude. … Read moreCoefficient change due to change in latitude
Probable cause to develop coefficient A If there is a constant deviation but magnetic compass is well sitted. Then this is due to coefficient apparent A. Probable cause:Variation incorrect.Constant LHA error.Faulty Azimuth mirror.Faulty pivot point for compass card.Lubber line is not in line with the F&A line of the ship.NS line of compass card is … Read moreProbable cause to develop coefficient A
Transmitting magnetic compass operating principle Conversion of magnetic compass into repeating compass.Flux gate is mounted below the compass card.Flux gate can detect magnetic field direction. (Position of the rotating compass card)Flux gate will produce output signal. Construction:Flux gate consists of two thin wires of mumetal.Each thin wire is placed inside a glass tube.Each Glass tube … Read moreTransmitting magnetic compass operating principle
Performance standard for magnetic compass Compass Card:Graduated in 360 degrees.Numerical indication at every ten degrees.Cardinal point indication by capitial letters N, E, S and W.North point indication by suitable emblem.Directional error should not exceed 0.5° on any heading.Clearly readable at a distance of 1.4 m.Magnifying glass is permitted. Materials:Corrector magnets for parmanent magnetism should have … Read morePerformance standard for magnetic compass
Method of correcting HE of Compass: Two ways: For small ship and for large ship.(1) For small ship:Steady the vessel on N or S compass heading.Heel the vessel by 5 or 10 degrees.Remove any heeling error by inserting heeling error magnet in HE bucket. (2) For large ship:Use heeling error instrument “VFI”Vessel should be upright.Remove … Read moreMethod of correcting HE of Compass