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Appendix G: Glossary of terms
Abbreviation
Meaning
Definition
Active route
The route on a chart which is being used for navigation.
Awa
Apparent wind angle
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.
Aws
Apparent wind speed
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.
COG
Course over ground
Your direction of movement relative to a ground position.
CTS
Course to steer
The heading you need to maintain in order to reach your destination
Tab
Rudder tab
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.
Twa
True wind angle
The angle between True wind direction (Twd) and the centerline of your boat.
Twa is measured in degrees.
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RayTech RNS V6.0 - Users Guide
Twd
True wind direction
The magnetic direction that the wind is coming from, calculated to appear as though measured
from a stationary boat.
Twd is measured in degrees.
Vmg
Velocity made good
The boat’s speed towards or away from the Twd, used to measure performance relative to
upwind/downwind targets.
Abbreviation
Meaning
Definition
Summary of Contents for Pathfinder
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