Simrad AP26, AP27 manual Operating in Windnav mode, Racing

Installation

Operating in WINDNAV mode

Refer to Figure 2-3with 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.

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