Simrad Autopilot AP26 - Manual (Page 39)

Installation
20221586B
37
Operating in WIND
NAV
mode
Refer to Figure 2-3 with references [ ] the associated displays
and the criteria (bullets) below.
• The set wind angle should be larger than the ‘Minimum
wind angle’ set in the Installation/Dockside menu and
smaller than 170° Apparent.
• Information about when it is time to head directly towards
the waypoint, Distance To Turn (DTT) and Estimated Time
to Turn (ETT) are displayed. These calculations are based on
the assumption that the set wind angle will be the same or
larger after a tack or gybe towards the waypoint [2][3].
• A turn prompt will appear when it is time to head towards
the waypoint and the autopilot will calculate and display the
change of heading by comparing between the current
heading and the heading towards the waypoint (CHG) [5].
• When heading towards the waypoint, the autopilot utilizes
either the XTE from the GPS/Chartplotter to maintain track
or a layline calculated by the autopilot. The calculated
layline applies when the Cross Track Error (XTE) from the
external navigator is larger than 0.15 nm [8].
RACING
If ‘Wind setup’ is set to ‘RACING’ in the Installation/Dockside
menu, a more advanced steering is possible:
• Optimising VMG to wind may be enabled when beating and
it is not possible to head directly towards the waypoint [2][4].
• Layline steering may be disabled when heading directly
towards the waypoint. Instead you can optimise the Waypoint
Closure Velocity (WCV) by trimming the sails and the set
wind angle. A turn prompt will then be displayed if the
difference between Course Over Ground (COG) and Bearing
Position Waypoint (BPW) exceeds 30° when heading
towards a waypoint [8].
See chapter 2.22 User Set-up Menu on how to access these
parameters.