Glossary Of Terms - Raymarine Pathfinder Manual

Appendix G: Glossary of terms
Abbreviation Meaning
Active route
Awa Apparent wind angle
Aws Apparent wind speed
COG Course over ground
CTS Course to steer
Tab Rudder tab
Twa True wind angle
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Abbreviation Meaning
Twd True wind direction
Vmg Velocity made good
Definition
The route on a chart which is being used for navigation.
The angle of wind as measured by your boat's instruments.
When the boat is stationary, Awa is equal to True wind angle (Twa). When the boat moves, Awa
is always less than Twa.
Awa is measured in degrees.
The speed of wind as measured by your boat's instruments.
When sailing upwind, Aws is always greater then True wind speed (Tws). When sailing down-
wind, Aws is always less than Tws.
Aws is measured in knots.
Your direction of movement relative to a ground position.
The heading you need to maintain in order to reach your destination
An adjustable section of the rudder that allows the rudder to be corrected for lee or weather
helm as appropriate.
Adjustment is measured in degrees.
The angle between True wind direction (Twd) and the centerline of your boat.
Twa is measured in degrees.
Definition
The magnetic direction that the wind is coming from, calculated to appear as though measured
from a stationary boat.
Twd is measured in degrees.
The boat's speed towards or away from the Twd, used to measure performance relative to
upwind/downwind targets.
RayTech RNS V6.0 - Users Guide
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