Navigation Flashcards
Describe degrees of arch
Measurements along earths meridians in perfect circles
What are 4 ways of expressing direction
True bearing
Compass bearing
Relative bearing
Reciprocal bearing
Describe dead reckoning
Position is determined through the direction and distance a ship has traveled from a known point of departure
Describe latitude and longitude
Parallels and meridians runs either north south east to west
Describe election navigation
Position is determined much as it is in piloting except that the bearing and distance are obtained by electronic means
Parts of maneuver board
Radial straight lines
Two sets of bearings printed out
Ratio scales on left and right side
Describe a parallel
Parallels are imaginary parallel circles around the earth 180° of arch
5:1 scale is for distances between what and what
40000 to 50000
Characteristics of navigation fixes
A line of bearing and distant arc Two or more lines of bearing Two or more distant arc Range and a line of bearing A range and a distant arc
3:1 scale is for distances between what and what
20000 to 30000
Two types of piloting instruments
Bearing circle
Telescope alidade
3 minute rule what is it
Shortcut to determine speed or distance by using how many yards in 3 minutes
Piloting record log
Bearings, ranges, and sounding
Describe line of position
Two or more lines intersect reference to a land mark by range bearing and distance arcs
Describe Celestial navigation
Position is found by locating a ship with relation to the stars needs a sextant
Describe relative motion
Apparent movement that takes place between two independently moving ships
Name 4 types of determining ships position
Piloting
dead reckoning
Celestial navigation
electronic navigation
2:1 scale is for distances between what and what
10000 to 20000
What are the lines called that travel from north to South Pole?
Meridians
At the equator, each meridian is how far apart
60 minutes
Or
3600 seconds
4:1 scale is for distances between what and what
30000 to 40000
1:1 scale is for distances between what and what
0 to 10000
Describe a maneuvering boards
Solves relative movement between ships
Greenwich meridian is number what?
Zero
Describe piloting navigation
Position is determined by bearing or distance from visible objects on the earths surface or by sounding
