Tidal Current Tables
Mariner's Guide
Tide Tables
Nautical Almanac
Parabolic
Directional
Hyperbolic
Linear
It corrects the semi-quadrantal error at intercardinal headings.
It compensates for the error caused by the vertical component of the earth's magnetic field.
It allows the magnetic compass to move freely in the fluid.
It reduces the deviation into half.
Large scale chart
General chart
Coastal chart
Small scale chart
Sh
Cl
Co
R
100 m
50 m
20 m
10 m
960
760
23.25
29.92
Astronomical twilight
Civil twilight
Nautical twilight
Observational twilight
Black band with above and below yellow band
Black band above and below yellow band
Black band below yellow band
Black band above yellow band
"Night effect" is most prevalent late at night
During "night effect", polarization is at a minimum
"Night effect" is caused by all of the polarized ground waves being vertical
"Night effect" is caused by rapid changes in the ionosphere
15deg. E
7 1/2deg. E
0deg.
7 1/2deg. W
1 degree
0.2 degree
0.5 degree
0.1 degree
1 astronomical unit (AU)
1 celestial unit
1 parsec
4.3 light years
1. 50,000
Not more than 1. 25,000
1. 200,000
1. 1,000,000
1013.25 millibars of mercury
1012.45 millibars of mercury
1013.52 millibars of mercury
1012.35 millibars of mercury
234deg. T
063deg. T
270deg. T
243deg. T
3 mins and 26 secs
3 mins and 36 secs
3 mins and 06 secs
3 mins and 56 secs
Astern and equal to the ship's speed
Ahead and equal to the ship's speed
Ahead and equal to twice the ship's speed
Astern and equal to twice the ship's speed
Increase the scope of anchor cable
Shorten the scope of anchor cable
Put over a stern anchor
Dropped another anchor
Taking a radar range and radar bearing
Taking several radar bearings
Taking several radar ranges
Taking a radar range and visual bearing
Dead-reckoning
Probable position
Applied position
Fix
1010.35 millibars
1012.35 millibars
1013.25 millibars
1015.25 millibars
Difference is assumed latitude and actual latitude
Inaccuracies in the reading and reference level
Double-second difference
Chronometer error and dip
Nautical Almanac
Mariner's Guide
Tide Tables
Tidal Current Tables
1.5 kilometers per second
1.3 kilometers per second
0.8 kilometer per second
1.1 kilometers per second
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