Furuno 511 - Manual (Page 4)

1. OPERATION
2
1.1.2 Displays
(Navpilot-500)
There are four types of displays; Normal display, Normal display 2, Data display
and Graphic display.
(Navpilot-511/520)
There are three types of displays; Normal display 1, Normal display 2 and Data
display.
To choose a display mode, press the [AUTO] key.
1.1.3 Selecting the wind angle mode
The wind mode has two wind angle modes, AWA (Apparent Wind Angle) and
TWA (True Wind Angle).
AWA: The direction (in relation to ship’s bow) of the wind as it appears to that on
board, detected by the wind sensor. AWA mode requires wind angle and speed
data. Use this mode when wind is stable.
TWA: The actual wind direction; combination of the AWS (Apparent Wind Speed)
and own boat’s speed. This mode requires apparent wind angle, apparent wind
speed, own boat’s speed and own boat’s heading. Use this mode when there is
a downwind unstable.
Own boat's
Heading
True wind angle (TWA) N
Apparent wind speed
(AWS)
True wind speed
(TWS)
Apparent wind angle (AWA)
Own boat's
Speed
Apparent/True wind angle
When running on engine, use the TWA (or AUTO) mode.
The autopilot cannnot control your boat when the boat's
speed exceeds the true wind speed in AWA mode.
NOTE