Flotilla Navigation Study Guide Chapter 1: Introduction to Navigation Instructor: Walter Spall Selected Questions: Study these for exam PowerPoint Presentation by Forrest Meiere

Flotilla Navigation Study Guide S1-6. The process of predicting the future position from knowledge of its present position, course steered and speed is termed ___________________. S1-7. The earth revolves about an axis passing through the earth’s center and intersects the surface at two points, termed ______________________________. dead reckoning (DR) north and south geographic poles S1-8. A plane passing through the earth’s center intersects the surface to produce a ____________. great circle

Flotilla Navigation Study Guide S1-9. On the surface of a sphere, the shortest distance between any two points lies on a ____________ connecting them. S1-10. If a plane passing through the earth’s center is perpendicular to the axis of rotation, it forms a great circle termed the _________. great circle equator S1-11. The upper branch of the great circle passing through the poles and Greenwich, England is called the ____________________________________. prime meridian or Greenwich meridian

Flotilla Navigation Study Guide S1-12. A circle contains ____ degrees. Degrees are subdivided into ________ and ___________________________. S1-13. __________ (Lo) is the angle between a position on earth and the prime meridian measured east or west. 360 minutes seconds or tenths of minutes Longitude S1-14. A plane passed through the earth that does not touch the earth’s center forms a ___________ on the surface. small circle

Flotilla Navigation Study Guide S1-15. The angle between a position on earth and the equator measured north or south is _______________________. S1-16. Any position on the earth’s surface can be defined by specifying its ________ and __________. Latitude or Lat or L latitude longitude S1-17. One degree of _________ equals 60 nautical miles. Not so for _________ except at the equator. latitude longitude

Flotilla Navigation Study Guide S1-18. Three common ways to specify direction are ___________________________. S1-19. When a course crosses each meridian at the same angle the resultant line is called a ____________ or ____________. true, magnetic, compass rhumb line loxodrome S1-20. The earth has a __________________, thought to be generated by the flow of the liquid iron alloy core of the planet. (a little more complicated than this; FM) weak magnetic field

Flotilla Navigation Study Guide S1-21. At the surface of the earth, lines of magnetic field are termed, __________________ analogous to __________ meridians. (magnetic field, not force) S1-22. The angle between geographic and magnetic meridians is called _________________ or _________. magnetic meridians geographic magnetic variation variation S1-23. Variation is said to be _____ if the magnetic meridian points east of geographic north. east

Flotilla Navigation Study Guide S1-26. To convert from relative bearing to true or magnetic use the equation: _____________ + ______________ = _______________. If this exceeds _____, subtract ______. ship’s heading relative bearing object’s bearing 360° 360° S1-27. An object off the stern has a relative bearing of ____ while one directly off port has a relative bearing of _____ S1-28. Normally, the ___________ of the compass rose references _____ north while the ____________ references ______________. outer circle true inner circle magnetic north