KRP

Why HE not remain constant with change of latitude Heeling error changes with:Change in course.Change in latitude.Change in angle of heel. Change in course:HE changes with change in course. Why?We know, deviating force acts athwartship. Since HE error cause: Ship’s permanent component (R).Induced by Z into VSI, acting through the compass position.Induced by Z into … Read more

Permanent magnetism and Induced magnetism, correction Parmanent Magnetism:PQR force is due to parmanent magnetism.Caused during ship building.Remain constant throughout lifespan.Do not change with latitude, heading, northern or southern hemisphere.Correction is done by parmanent magnets. Correction of parmanent magnetism:F & A and Athwartship magnets.Parmanent magnet of 8” in length and diameter of 3/8” and 3/16”.To correct … Read more

VFI, Heeling error VFIVertical Force instrument.Graduated compass needle attached with sliding weight.Rides on a sharp pivot point.Housed in a brass case.Graduated compass needle can align itself with Earth’s magnetic field.Sliding weight can move in or move out from center.By measuring the sliding weight distance, vertical force is found. Heeling error Cause:Ship’s permanent component (R).Induced by … Read more

Sequence of placing correctors, precautions during swinging Bi – D – E – HE – Bp – Cp(1)If -Bi, place flinder bar forward.If +Bi, place flinder bar aft.If superstructure abaft the compass, flinders bar on forward part. If superstructure forward of the compass, flinders bar on after part.(2)If +D, place quadrantal spheres athwartship.If -D, place … Read more

Compass correctors, cause and compensation. Coefficient details Coefficient A:Cause:Induced by H Unsymmetrical, if vessel swing too quickly.Compensation:Can’t be corrected. Coefficient B:B = Bp + BiCause:Ship’s permanent component (P).Induced by Z into VSI, F&A.Compensation:If +Bp, place parmanent red pole forward.If -Bp, place parmanent red pole aft.If -Bi, place flinder bar forward.If +Bi, place flinder bar aft.If … Read more