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Northstar M121/M84 Installation and Operation Manual98
20-11-1 Installation: Northstar VHF radio
Fit and set up the optional Northstar VHF
radio (with NavBus functionality) following the
instructions supplied with the radio.
Black
Power/data cable
Orange Blue
Blue Grey
Radio data cable
NavBus is Northstar’s system for connecting
instruments together to interchange data
and share transducers. When instruments are
connected by NavBus:
If the units, alarms or calibration are
changed 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. If the backlight is changed 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 the backlight is changed in an instrument
in group 0 then no other instruments are
affected.
If an alarm sounds, mute it by clearing the
alarm on any instrument which can display
that alarm.
NavBus and the Instrument
The M121/M84 can:
Display wind speed and direction from an
optional Northstar Wind instrument
Receive and display depth from an optional
Northstar depth instrument.
Receive and display boat speed and water
temperature from a paddlewheel sensor on
an optional Speed instrument.
Receive data from an optional Northstar
VHF radio (with NavBus functionality). The
M121/M84 can display:
Baro: barometric pressure
Baro history: barometer history
Weather: a predication, based on changes
in barometric pressure
20-10 Installation: Other NavBus instruments
Fish forecaster: a prediction based on
changes in barometric pressure
DSC/Buddy Track: (see section 17)
Receive data from an optional GPS or
GPS/DGPS source.
Send data to optional Northstar instruments,
for example to a repeater.
During setup for NavBus instruments, set
NavBus to
and assign the instrument a
NavBus group number (see section 19-12)
Black
Power/data cable
Orange
Blue
NavBus wires to other
NavBus instruments