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. If you experience difficulty installing the chartplotter, seek the assistance of a professional installer, or contact Garmin Product Support.
Before installing your GPSMAP 400 or 500 series chartplotter, confirm that the package contains the items listed on the box. If any parts are missing, contact your Garmin dealer immediately.
WARNING: See the Important Safety and Product Information guide in the product box for product warnings and other important information.
Warning: Always wear safety goggles, ear protection, and a dust mask when drilling, cutting, or sanding. 
notice: When drilling or cutting, always check the opposite side of the drilling or cutting surface.
1Select 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 |
March 2012 | Printed in Taiwan |