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Appendix F: Glossary of terms
Term Meaning
Definition
Awa
Apparent wind angle
The angle of wind as measured by your vessel’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. Measured in degrees.
Aws
Apparent wind speed
The speed of wind as measured by your vessel’s instruments. When
sailing upwind, Aws is always greater than True wind speed (Tws).
When sailing downwind, Aws is always less than Tws. Measured in
knots.
Twa
True wind angle
The angle between True wind direction (Twd) and he centerline of the
vessel. Measured in degrees.
Tws
True wind speed
The velocity of the wind relative to the surface of the water. Measured
in knots.
Twd
True wind direction
The magnetic direction that the wind is coming from, calculated to
appear as though measured from a stationary boat. Measured in
degrees.
Active route
The route on the chart which is being used for navigation.
Vmg
Velocity made good
The vessel’s speed towards or away from the Twd, used to measure the
performance relative to upwind/ downwind targets.
Tab
Rudder tab
An adjustable section of the rudder that allows the rudder to be cor-
rected for lee or weather helm as appropriate. Measured in degrees.
Summary of Contents for RayTech RNS 5.0
Page 1: ...RayTech RNS V5 0 User Manual Document Number 81216_2 Date May 2004 ...
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