Title: Maneuvering Board Fundamentals NS 302
1Maneuvering Board FundamentalsNS 302
2Lesson Overview
- Own Ship
- Line of Sight
- Bearing
- True
- Relative
- Reciprocal
- Bearing Drift
- Target Angle
- Cardinal Intercardinal Directions
- True
- Relative
3Own Ship
- Self-explanatory - your ship
4Bearing
- imaginary line of direction across the water (or
land) from you to an object such as a ship. - This imaginary line is also called a line of
sight.
Own Ship (You)
Other Ship
5Bearing
- Measured in degrees clockwise from a reference
point. - Always use three digits to express a bearing in
degrees.
6True Bearing
- Measured from true north clockwise to the line of
sight.
315
7True Bearing
Own ship heading does not affect true bearing
135
Contact heading does not affect true bearing
8Reciprocal Bearing
- Bearing in the opposite direction of the line of
sight.
9Reciprocal Bearing
Like true bearing, own ship and contact headings
do not affect the reciprocal bearing
10Relative Bearing
- Measured from own ships heading clockwise to the
line of sight. - Ships bow is always 000R.
315 270R
045 000R
Always specify relative bearings with R
11Relative Bearing
Own ship heading DOES affect relative bearing
Contact heading does not affect relative bearing
12Converting Bearings
- To convert between true and relative bearing
TB SH RB
True Bearing
Ships Head
Relative Bearing
13Target Angle
Relative bearing from contact to you
Own ship heading does not affect target angle
Contact heading DOES affect target angle
14Bearing Drift
- Simply a change in bearing
- Can be used to determine whether the contact will
pass ahead or astern - Right Bearing Drift - bearing increases
- Left Bearing Drift - bearing decreases
- Constant Bearing - no bearing change
15Cardinal andIntercardinal Directions
- Provide another means to express direction.
- You already know now to express true cardinal
directions.
16True Cardinal andIntercardinal Directions
North 000T
Northwest
Northeast
West 270T
East 090T
Southwest
Southeast
180T South
17Relative Cardinal andIntercardinal Directions
- Parts of the ship used to reference direction.
Ahead 000R
Port Bow
Stbd Bow
Stbd Beam 090R
Port Beam 270R
Port Quarter
Stbd Quarter
180R Astern