Garmin GPSMAP 420 GPS Receiver User Manual


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GPSMAP 400/500 Series Installation Instructions
Your GPSMAP 400/500 series chartplotter must be properly installed according to the following instructions. You need the appropriate
fasteners, tools, and mounts listed in each section. 

Before installing your GPSMAP 400 or 500 series chartplotter, conrm that the package contains the items listed on the box. If any parts are
missing, contact your Garmin dealer immediately.
: See the Important Safety and Product Information guide in the product box for product warnings and other important
information.
Always wear safety goggles, ear protection, and a dust mask when drilling, cutting, or sanding.
When drilling or cutting, always check the opposite side of the drilling or cutting surface.
To install and use your chartplotter:
1 Select a mounting location (page 2).
2. Mount the chartplotter (page 2).
3. Install the transducer, if applicable (page 3).
4. Install the wiring harness (page 6).
5. Connect the chartplotter to a NMEA 2000 network (optional, if applicable) (page 8).
6. Connect the cables to the chartplotter (page 9).
7. Test the installation (page 9).
Chartplotter Functionality Matrix
The chartplotters in the GPSMAP 400/500 series have different functionality based on model number. Use this matrix to determine the feature
set and installation requirements of your chartplotter.
Chartplotter NMEA 2000 NMEA 0183 Garmin CANet Sonar
GPSMAP 420/430/430x/440/440x/450 No Yes Yes “s” version only
GPSMAP 520/525/530/535/540/545/550/555 No Yes Yes “s” version only
GPSMAP 421/441/451 Yes Yes No “s” version only
GPSMAP 431/531 No Yes No “s” version only
GPSMAP 521/526/536/541/546/551/556 Yes Yes No “s” version only
September 2009 190-01074-02 Rev. B Printed in Taiwan
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