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Northstar Explorer D310 Installation and Operation Manual
7
Keel offset
(negative)
4 Systems of several instruments
Several Northstar instruments can be connected together to share data. There are two ways of connecting
instruments together, NavBus or NMEA.
4-1 NavBus
3-4 Anchor watch
To set an anchor watch, set the too shallow alarm to
slightly less than the current depth and set the too deep
alarm to slightly more than the current depth. Allow for
tide changes.
3-5 Set keel offset
Keel offset is described above. The range is ± 2.9 m (± 9.6
ft, ± 1.6 fathoms):
1 Press + to display the Keel Offset screen.
2 Press or to change the keel offset.
3 Press .
NavBus is a Northstar proprietary system that allows
systems of multiple instruments to be built using
a single set of transducers. When instruments are
connected by NavBus:
If you change the units, alarms or calibration
in one instrument, then the values will
automatically change in all other instruments of
the same type
Each instrument can be assigned to a group
of instruments (see section 6-2, step 2). If
you change the backlight in an instrument
in group 1, 2, 3 or 4 then the backlight will
automatically change in the other instruments
in the same group. If you change the backlight
in an instrument in group 0 then no other
instruments are affected.
If an alarm sounds, mute it by pressing
on
any instrument which can display that alarm.
NavBus and the Explorer D310
If the Explorer D310 does not have a depth
transducer fitted then the unit will automatically
take depth readings from another instrument,
via NavBus, if the data is available. For more
information, refer to the NavBus Installation and
Operation manual.
Note: If a transducer is not fitted to the unit and the
corresponding external data is not available then
the displayed value will be dashes (— —).
4-2 NMEA
NMEA is an industry standard, but is not as flexible
as NavBus as it requires dedicated connections
between instruments. Depth data is output by the
Explorer D310 and can be read and displayed by the
Northstar Explorer R310 or other NMEA instrument.