Raymarine Marine GPS System User Manual page 154

The Downwind Plot screen (Figure 5-20) calculates the best angle and
boat speed when sailing downwind and displays:
Velocity Made Good relative to True Wind Angle – click
to view, then select the True Wind Speed range to plot
Vmg
by clicking on the
numbers directly.
Boat Speed relative to True Wind Speed – click
True Wind Angle relative to True Wind Speed – click
view.
Figure 5-20. Downwind Plot Screen
Advanced Navigator Functions
Tws (kts) up/down arrows or by entering
to view.
Bsp
to
Twa
5-63