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Flotilla 12-10 Navigation Study Guide Chapter 2: Compass PowerPoint Presentation by Forrest Meiere Instructor: Forrest Meiere All Questions and Problems.

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Presentation on theme: "Flotilla 12-10 Navigation Study Guide Chapter 2: Compass PowerPoint Presentation by Forrest Meiere Instructor: Forrest Meiere All Questions and Problems."— Presentation transcript:

1 Flotilla 12-10 Navigation Study Guide Chapter 2: Compass PowerPoint Presentation by Forrest Meiere Instructor: Forrest Meiere All Questions and Problems from the Study Guide

2 Flotilla 12-10 Navigation Study Guide S2-1 In the modern compass, the north-seeking magnets are attached to a ______________ or compass rose. S2-2 The dials of most compasses are graduated in degrees, with numbers every 30°, and the ______________ (N,E,S,&W). Arrows or other marks are sometimes used to denote the __________________ (NE,SE,SW, & NW). lightweight dial cardinal points intercardinal points S2-3 The compass dial is supported on a jeweled bearing which turns on a pivot. In turn, the pivot is mounted in a _____________, designed to keep the dial level with the horizon if the vessel pitches or rolls. gimbal system

3 Flotilla 12-10 Navigation Study Guide S2-4Fastened to the gimbal is one or more against which the dial graduations can be read to determine the direction of the vessel relative to the card. S2-6During the mid-1920's an electronic compass termed a compass was developed for aircraft. In recent years, this has become available to the mariner. Lubber's Lines fluxgate S2-5There are two principal types of compass dial design, the ___________________ and the _____________________. top-reading compass front-reading compass

4 Flotilla 12-10 Navigation Study Guide S2-7The modern magnetic compass is highly sensitive and is able to align itself with, such as the earth's magnetic field. S2-8However, the magnetic field aboard a vessel is not solely due to the earth's magnetic field. Other shipboard magnetic fields are caused by a variety of items, including: weak magnetic fields shipboard electronics, windshield wiper, motors, compressed gas horns, tachometers, electrical motors, television sets and other equipment. (no need to memorize this list; FM)

5 Flotilla 12-10 Navigation Study Guide S2-9These additional fields also affect the compass, with the result that the of the vessel may differ from its. S2-10Simply put, is the difference between the direction that the compass actually points and the direction that it would point if there were no local magnetic fields aboard the vessel. compass heading magnetic heading deviation S2-11The mariner has two options for dealing with deviation: _______ any residual error or correct for deviation. ignore

6 Flotilla 12-10 Navigation Study Guide S2-12Unlike variation, which depends solely on the vessel's position, deviation varies with the vessel's ________. heading S2-13The process of developing a deviation curve is often termed __________________________________. swinging ship or swinging the compass S2-14If the compass bearing of an object is less than the magnetic bearing, as determined from the chart, the deviation is ____. A simple rule is “ _____________________.” east compass least, error east

7 Flotilla 12-10 Navigation Study Guide S2-16The letter sequence TVMDC is used to describe the sequence of starting with a course, correcting for __________ to calculate a course, and finally allowing for to calculate a course. True Variation Magnetic Deviation Compass S2-15A device for measuring relative bearings is termed a. pelorus S2-17When converting from a true course to a compass course (i.e. uncorrecting), westerly variation and deviation are to be. added

8 Flotilla 12-10 Navigation Study Guide S2-18When converting from a compass to a true course (correcting), variation and deviation are to be and variation and deviation are to be subtracted. S2-19It is important to remember that compass readings are most accurate only when the vessel is level,, and maintaining a constant course. East added West S2-20Otherwise a series of additional compass errors can arise, including _____________________ ____________________________________________. northerly turning error acceleration error; oscillation error; heeling error (No need to memorize these errors. FM) traveling at a constant speed End of Questions

9 Flotilla 12-10 Navigation Study Guide P2-1: T V M D C 29W287C 258M P2-2: T V M D C 060M 056C P2-3: T V M D C 9W 4W045C 4E 032 041M

10 Flotilla 12-10 Navigation Study Guide P2-5: T V M D C 022M 4E 018C P2-6: T V M D C 0139W022M 4E018C 270R 283 (True Bearing to Vessel) P2-4: T V M D C 0139W 022M

11 Flotilla 12-10 Navigation Study Guide P2-7 T V M D C 15E035C P2-7 through P2-16: Variation = 015E. T V M D C 15E 055040M 5E P2-8 T V M D C 15E135C 149134M 1W P2-9 T V M D C 14915E 134M1W135C 035R 184(True) Bearing to Buoy

12 Flotilla 12-10 Navigation Study Guide 192M Reciprocal P2-10 T V M D C 15E285C 297282M 3W 090R 387 (Subtract 360) 027(True) Lighthouse Bearing P2-11 T V M D C 02715E +180to find reciprocal 207 (True) Reciprocal Bearing T V M D C 20715E

13 Flotilla 12-10 Navigation Study Guide P2-12 T V M D C 15E185C 285R 481 - 360 = 121: Bearing +180 (to find reciprocal) 301 (True) Reciprocal 196181M 4W P2-13 T V M D C 11015E 095M 3E092C 285R Buoy “6” Bearing 002C <== 362C

14 Flotilla 12-10 Navigation Study Guide P2-14 T V M D C 20015E 185M 4W 189C P2-15 T V M D C 15E145C 158143M 2W P2-16 T V M D C 15E 323C 338323M 0 End of Problems


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