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GPSMAP 400/500 Series Installation Instructions 

9

Connecting Cables to the Chartplotter

Use the diagrams below to help identify the connectors on the back of your GPSMAP 400/500 series chartplotter. Every possible chartplotter 

configuration is not represented in the diagrams, but every possible connector type is listed for identification purposes. Every connector on the 

back of the chartplotter may not be used for all installations.

 

Wiring harness

➋ 

NMEA 2000

➌   

External GPS 

antenna (sold 

separately)

   Compatible XM 

antenna with 

audio adapter 

(sold separately)

   Compatible XM 

antenna (sold 

separately)

GPSMAP 526, 536, 546, and 556

GPSMAP 420, 430, 431, 440, and 450

GPSMAP 430x and 440x

GPSMAP 421, 441, and 451

GPSMAP 521, 541, 551

GPSMAP 530, 535, 540, and 545

➋ ➊

Testing the Installation

To turn on your chartplotter for the first time, press and hold the 

 

PoWeR

 key until the chartplotter beeps and turns on. Using the 

ROCKER 

and the 

SeLect 

keys, follow the screens to configure your chartplotter.

Testing the Optional Transducer Installation

Because water is necessary to carry the sonar signal from the sounder, the transducer must be in the water to work properly. You cannot get a 

depth or distance reading when the transducer is out of the water. 

When you place your boat in the water, check for leaks around any screw holes that were added below the water line. Do not leave your boat in 

the water for an extended period of time without checking for leaks.

Summary of Contents for GPSMAP 420

Page 1: ...ing 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...

Page 2: ...unting the Chartplotter Use the included bracket to surface mount the chartplotter You will need the following tools and fasteners Drill Phillips or flat screwdriver Three 8 4 mm pan head machine bolt...

Page 3: ...If the transducer lead is too short extension cables are available from your Garmin dealer Assembling the Transducer 1 Insert the rubber washer H and the plastic spacer G into the transducer at the sa...

Page 4: ...distance between the transducer and the top of the transom 6 Mark the location Drill a 1 8 in 3 2 mm pilot hole approximately 3 8 in 9 5 mm deep 7 Attach the cable clamp using one of the 4 12 mm scre...

Page 5: ...GPSMAP 525 535 545 555 526 536 546 556 or with non s models compatible with a GSD 22 When installing a transducer consider the following The hull must be composed of solid fiberglass without air bubb...

Page 6: ...ss Do not cut the transducer cable because this voids your warranty Notice The maximum input voltage is 32 Vdc Do not exceed this voltage because this can damage the chartplotter and void the warranty...

Page 7: ...ce 3 Repeat step 2 using the grey and violet wires for an additional NMEA 0183 device 4 Set the serial port s on the chartplotter to use NMEA 0183 data standard or high speed See the GPSMAP 400 500 Se...

Page 8: ...n existing NMEA 2000 network on your boat you will need to build one See www garmin com for more information NOTE NMEA 2000 compatible GPSMAP 400 500 series chartplotters are not packaged with NMEA 20...

Page 9: ...6 GPSMAP 420 430 431 440 and 450 GPSMAP 430x and 440x GPSMAP 421 441 and 451 GPSMAP 521 541 551 GPSMAP 530 535 540 and 545 Testing the Installation To turn on your chartplotter for the first time pres...

Page 10: ...l 12 7 cm Full VGA display with adjustable brightness 640 480 pixels capable of 4 096 colors Case Fully gasketed high impact plastic alloy waterproof to IEC 529 IPX7 standards Temp Range From 5 F to 1...

Page 11: ...roduct Information 126996 Product Information 127250 Vessel Heading 127250 Water Depth 127488 Engine Parameters Rapid Update 128259 Speed Water Referenced 127489 Engine Parameters Dynamic 128267 Water...

Page 12: ...py of this manual or of any revision hereto provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthori...

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