Northstar M121/M84 Installation and Operation Manual 91
• Replacement paddle wheel.
• C-MAP™ NT-MAX, NT+ or NT chart SD cards.
• Northstar NavBus junction boxes simplify
wiring, particularly if several instruments are
connected. For more information, see the
NavBus Installation Manual.
Optional sensors and instruments
External alarms: Lights or sounders in the
boat to sound alarms through the boat (see
section 20-4).
GPS or DGPS antenna: For GPS navigation,
see section 20-5.
Sonar transducer: For depth sounding and
fish finding, see section 20-6.
Fuel sensors: For fuel functions. The
Instrument can use these optional fuel flow
sensors, fitted to one or two engines:
• Northstar petrol/gasoline sensors (see
section 20-7)
• SmartCraft fuel sensors (see section 20-8)
20-2 Installation: Options and Accessories
DSC VHF radio: Tracks other boats with
GPS receivers and DSC radios and displays
barometric pressure (see section 20-10).
SmartCraft: With one or two SmartCraft
capable Mercury petrol/gasoline engines, the
Instrument can display engine data and trim
and can control troll speed (see section 20-8).
Radar: For radar functions. A Northstar 2 kW, 4
kW or 6 kW radar system must be installed (see
section 20-9).
Other instruments: The Instrument can
receive data from other instruments and send
data to other instruments by NavBus or NMEA
(see sections 20-11 and 20-12).
Please consult your Northstar dealer for more
information.
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