Loading three.js…

Instruments

Boat speed
0.0 kn
Heading
000°
VMG (upwind)
0.0 kn
True wind
0 kn / 000°
Apparent windApparent
0 kn @ 0°
Heel
Leeway
Reef
Full sail
Tiller centred
Mainsheet (boom limit)
DRAWING

Conditions

Course: sail to the marks in order
TILLER — slide, self-centres
EASE
IN
Rotate to landscape for the best layout
Touch controls
Slide the blue tiller pad — push right to turn left, like a real tiller; it self-centres when released.
Drag the yellow sheet knob: up eases the sail out, down sheets it in.
Reef +/− shortens / restores the sail. Cam cycles views. Drag the sea to orbit, pinch to zoom. ☰ opens wind, waves and weather.
Close-hauled is ~45° off the wind with the sail nearly centred. Ease as you bear away. Reef when heel passes ~30°.
Controls
A/D or / tiller left / right (hold; self-centres). Tiller right = bow goes left
Q/E tiller without self-centring
W/S or / ease sheet out / sheet in
R reef in   F shake out reef
V cycle camera   Mouse drag orbit   Wheel zoom
Space pause   Backspace reset   H hide help   Enter fullscreen
Tip: close-hauled is ~45° off the wind with the boom ~10° in. Ease the sheet as you bear away. Reef when heel passes ~30°.