Navman WIND 3100 User Manual

7
WIND 3100 Installation and Operation Manual
NAVMAN
Apparent wind speed and direction are the values
measured by the mast head unit on the boat. True
wind speed and direction are calculated values that
allow for boat speed.
If the boat is moving , then the apparent wind speed
is different to the true wind speed and the apparent
wind direction is different to the true wind direction,
as shown below.
2-6 Apparent and true wind speed and direction
Boat moving upwind. Apparent wind speed is greater than true wind speed
and apparent wind direction is closer to dead ahead than true wind direction
Boat is
at rest
True wind speed is the same as apparent wind speed and
true wind direction is the same as apparent wind direction
True
wind
speed
20 kts
Boat moving downwind. Apparent wind speed is less than true wind speed
and apparent wind direction is closer to dead ahead than true wind direction
True
wind
speed
20 kts
True
wind
speed
20 kts
Boat
speed
10 kts
True
wind
speed
20 kts
Boat
speed
10 kts
Boat
speed
10 kts
Apparent
wind speed
15 kts
Boat
speed
10 kts
Apparent
wind speed
15 kts
True wind
direction
45°
True wind
direction
135°
Apparent
wind
direction
107°
Apparent
wind
direction
30°
Apparent
wind speed
28 kts
Apparent
wind speed
28 kts

Navman WIND 3100 Specifications

General

Brand	Navman
Model	WIND 3100
Category	Measuring Instruments
Language	English