Tidal current common in bays and rivers

Direction toward which the current moves

Sun and moon aligned resulting in higher high and low tides

The angle on the horizontal plane between magnetic north and north on the compass

A line straight or curved along which the observer can presume to be located, derived from observations or measurements

Offshore tidal currents may be

Brief period of no discernable horizontal current flow

The moon is closer resulting in higher tides

The difference between the true course and the compass course

A vessels position determined by bearings either visual or electronic or other means that regarded to be acceptably accurate

Horizontal flow of water

Speed of current in knots

Sun and moon aligned at right angles resulting in higher low tides, and lower high tides

The error induced in a compass by local magnetic fields

An imaginary line on the earth cutting all meridians at the same angle and used as a standard method for plotting a ships location

Vertical rise and fall of water levels

S = Distance x 60 / Time

The moon is further away resulting in reduced tidal ranges

A direction in relation to the bow of the vessel expressed in degrees measured clockwise

Position determine by the intersection of two or more lines of position taken at different times - then advanced to a common time

1. Coriolis Effect
2. Unequal heating at different areas of the earth
3. Differences in sea water density of adjacent water

Type of water flows connecting two bodies of water

The difference between high and low waters

The direction from your location to any distant point given in degrees

Objects lined up to create a straight line