Simrad AP28 Technical Information download pdf (Page 34)

32 | Operation

keep the boat on the track line and direct the AP28 to the

destination waypoint.

If the AP28 is connected to a navigation receiver that

does not transmit a message with bearing to next

waypoint, it will steer on Cross Track Error (XTE) only. In

that case you have to revert to AUTO mode at each

waypoint and manually change set course to equal

bearing to next waypoint and then select NAV mode

again.

To obtain satisfactory navigation steering, the following

points must be fulfilled prior to entering the NAV mode:

• The AP28 autosteering must be tested and determined

satisfactory

• The navigation receiver (GPS, Chart Plotter) must be

in full operating mode with adequate signal

characteristics for valid position and navigation data

• At least one waypoint must be entered and selected as

the current “Go to” waypoint

The data source when operating in NAV mode is the

Navigation (Nav) source. It is normally the same as the

Position source (GPS/Chart plotter) see page 51.

Navigational steering should only be used in open waters.

When selecting NAV mode, the AP28 maintains the

current set course and prompts the user to accept the

course change towards the destination waypoint.

Press the NAV key to activate the NAV prompt display.

NAV

The prompt display shows the

name of the next waypoint (WP),

the bearing of the track line

(BWW) from the previous

waypoint to the destination

waypoint, the required course

change (CHG) and the direction

in which the boat will turn.

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Simrad AP28 Technical Information Page 34