46 | Operation
2.9 Wind steering and navigation
(sailboats)
The autopilot can also steer the boat given both wind
data and track data from a GPS/chart plotter. In this
mode called WIND
NAV
mode the automatic steering is
based on a set of criteria (see below). Wind steering and
navigation is activated by pressing the NAV key when in
Wind mode [1]. The initial course change (CHG) needed
to navigate towards the active waypoint, is calculated by
the autopilot. The autopilot will utilize the current wind
direction in these calculations and the change of course is
accepted by pressing the
softkey [2].
Operating in WIND
NAV
mode
Refer to Figure 2-2 which shows a scenario with a
sailboat that enters Wind
NAV
mode to sail the most
efficient way to waypoint WP1.
1. The autopilot is still in Wind mode approaching
mark 2 and waypoint WP1 has been entered on the
chart plotter.
2. The Wind
NAV
mode is entered and the autopilot
prompts confirmation for a course change of 71
degrees to starboard.
3. The boat is now on the leg to mark 4 where a
starboard tack is required to avoid running on
ground. The distance to tack DTT is displayed and
so is VMG to wind. Furthermore the autopilot
displays course to steer and heading.
4. The tack has been initiated on the autopilot and the
tack display is presented.
5. The autopilot now presents you with information
about the new leg and the next tack.
6. You are about to cross the layline and the autopilot
“recommends” a new tack to Port.
7. The new tack is performed.
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