Coastal Piloting Flashcards
Deviation, for plotting is caused by:
the boat
True North =
on the chart
Going from True North to Compass W = and E =
+W -E
From Ship’s Compass to True North W = and E =
-W +E
To convert Ships Compass to True, you first must apply __________first, then __________, adding east reading and subtracting west readings.
deviation first
then variation
Nautical Chart 1
is what you will use
_______________ (LNM) Weekly Updates all U.S. charts and publications. It is the primary means for communicating information pertaining to individual Coast Guard Districts. It is published electronically, and provides important safety information that is available nowhere else.
Local Notice to Mariners (LNM)
Chart Number ____: Nautical Chart Symbols, Abbreviations and Terms provides the descriptions of the basic elements and symbols used on nautical charts published by NOAA.
Chart No 1
______1_____of Latitude are imaginary circles on the surface of the earth, _____1_____to the ___2________, moving from the _____2____to the ________or _______ pole.
Parallels of Latitude parallel Equator Equator north south
1 degree = _____________miles
60 nautical miles
_________are great circles formed by a plane cutting through the earth’s axis and its poles. ________is measured both East and West for 180 degrees. Ex-90 degrees W or 90 degrees East
Meridians
Longitude
___________ Projection is used on most coastal navigation charts and is made by transferring the surface of the earth onto a cylinder.
Mercator
How many feet in a nautical mile
6076