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Northstar M121/M84 Installation and Operation Manual6
1-2 Cleaning and maintenance
The Instrument screen is covered by a
proprietary anti-reflection coating. To avoid
damage, clean the screen only with a damp
cloth and mild detergent when dirty or
covered in sea salt. Avoid abrasive cleaners,
petrol or other solvents. If a plug-in card gets
dirty or wet, clean it with a damp cloth or mild
detergent.
Cover or remove a transom-mounted
transducer when repainting the hull. If painting
over a through hull transducer with antifouling
paint, use only one coat of paint. Remove the
previous coat of antifouling paint by sanding it
lightly.
To optimize performance, avoid walking on
or jamming cables and connectors. Keep the
transducer free of weed, paint and debris. Do
not use a high pressure water blast on a speed
sensor paddlewheel as it may damage the
bearings.
Push the dust cover over the display when the
Instrument is turned off.
The Northstar M121/M84 is a rugged, highly
integrated marine chartplotter and fishfinder.
It is easy to use and has a high resolution color
display. Complex functions can be performed
with only a few key presses, taking the hard
work out of boating.
The available functions depend on the optional
sensors and instruments that are installed:
The Video window requires the M121/M84
to receive video from a compatible source,
such as a camera.
Fuel functions require one or more petrol/
gasoline or diesel fuel sensors to be installed.
SmartCraft engine functions require a
SmartCraft system to be installed. For
information on using SmartCraft, see
the SmartCraft Gateway Installation and
Operation Manual.
• DSC/Buddy track functions require an
appropriate Northstar DSC VHF radio to be
installed.
1-1 Overview
The M121/M84 can send data to other
instruments, such as an autopilot, and
receive data from other instruments.
• Radar functions require an optional
Northstar radar system to be installed. Three
radar systems are available; 2 kW, 4 kW, or 6
kW.
• AIS functions require an optional AIS receiver
to be installed.
For information on installation options, see
section 20.
This manual describes how to install and
operate the M121/M84. Special terms
are explained in Appendix C. For more
information on this instrument and other
Northstar products, go to our website, www.
northstarnav.com.
Radar Overview of the radar 18 Radar
The radar window explained 18-1 Radar
Change the radar operation mode 18-2 Radar
Change the radar rotation or motion mode 18-6, 18-7 Radar
Optimize the quality of the radar window 18-9 Radar
Find range and bearing with VRM/EBL 18-10 Radar
Set up the radar guard zones 18-12 Radar