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Northstar Explorer 538i/538 Installation and Operation Manual
11
MOB will not work if the Explorer 538/538i
does not have a GPS fix.
The MOB feature saves the boat’s position and
then navigates back to this point.
1 Press
.
The Explorer 538/538i stores the boat’s
position as a waypoint called MOB.
2 The Explorer 538/538i changes to the chart
display, with the MOB waypoint at the centre
of the chart.
The chart zooms in for accurate navigation.
If the chart can not show the required
small scale, the Explorer 538/538i changes
to plotter mode (a white display with
crosshatching and no chart details, see
section 14-2).
3 The Explorer 538/538i sets the MOB waypoint
to be the destination to navigate to.
If the NMEA output (autopilot) is off (see
section 14-9) use the Explorer 538/538i to
manually navigate to the destination MOB
waypoint (see sections 3-1-1 and 3-1-2).
2-4 Backlight and night mode
To go to the Backlight display, press briefly.
When you have finished, press
.
Backlight
The display and keys are backlit. To change the
backlight level, select
Backlight, then press
to dim or to brighten.
Tip: Press twice to give the brightest
screen, with maximum backlight and Night mode
off.
Night mode
Night mode sets the palette for all displays.
Normal palette, for daytime
A palette optimised for night time.
To change mode, select Night mode, then press
. To change only the chart palette, see section
17-2.
2-5 Man overboard (MOB)
If the NMEA output (autopilot) is on, the
Explorer asks if the autopilot is active. Select:
No: Use the Explorer 538/538i to manually
navigate to the destination MOB waypoint
(see sections 3-1-1 and 3-1-2).
Yes: The Explorer 538/538i asks if the boat is to
go to the MOB waypoint.
Select:
Yes: to immediately start navigating to the
MOB waypoint.
This might result in a sudden and dangerous
turn.
No: disengage the autopilot; then use the
Explorer 538/538i to manually navigate to the
destination MOB waypoint (see sections 3-1-1
and 3-1-2).
To cancel MOB or set another MOB
1 Press
again to display a menu.
2 Select an option from the menu.
Tip: The MOB waypoint remains on the chart after the MOB has been cancelled. To delete the MOB
waypoint, see section 5-2-5.
2-6 Alarms
When the Explorer 538/538i detects an alarm
condition, it displays a warning message on
the display, the internal beeper sounds and any
external beepers or lights operate.
Press
to clear the alarm. The alarm will
sound again if the alarm condition occurs again.
The Explorer 538/538i has user settable alarms
plus an alarm for loss of GPS fix (see section 14-7).