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GDL 40 Installation Instructions

Mounting the Antenna with the Cable 

Routed through the Pole

1.  Select a mounting location for the 

antenna, and verify correct operation at 

the mounting location (

page 2

).

2.  Temporarily position a standard marine 

pole mount (not included) in the 

mounting location you selected (

page 2

).

3.  Mark the approximate center of the pole.
4.  At the marked location, use a 

3

/

4

 in. 

(19 mm) bit to drill a hole for the cable 

to pass through.

5.  Fasten the marine pole mount to the boat 

(hardware not included).

6.  Thread the pole-mount bracket 

 onto 

the marine pole mount.

  Do not overtighten the bracket.

➋ 

➌ 

7.  Route a NMEA 2000 drop cable through 

the pole-mount bracket and the pole, and 

connect the cable to the antenna.

8.  Place the antenna on the pole-mount 

bracket, and twist it 

 to lock it in 

place. 

9.  Secure the antenna to the bracket with 

the included M3 set screw 

.

10. Route the NMEA 2000 drop cable away 

from sources of electronic interference.

11. Connect the antenna to your NMEA 

2000 network (

page 5

).

12. After the antenna is installed on the pole 

mount, fill the vertical cable slot with a 

marine sealant (optional). 

Mounting the Antenna under a 

Surface

NOTICE

When choosing a location to install the 

under-deck-mounting bracket, make sure 

the included screws are not too long for 

the surface thickness. If the screws are not 

appropriate for the surface, you must supply 

the correct length of M4 screws to avoid 

damage to the top of the mounting surface.
The antenna can be mounted under a 

fiberglass surface. Because the antenna has 

difficulty acquiring cellular signals through 

metal, it is recommended that you use the 

under-deck mount under a fiberglass surface.
1.  Identify the mounting location on the 

fiberglass surface 

, and verify correct 

operation at the mounting location 

(

page 2

).

➌ 

2.  Using the under-deck-mounting bracket 

 as a template, mark three pilot-hole 

locations 

 

on the surface.

3.  Use a 

1

/

8

 in. (3.2 mm) bit to drill the 

three marked pilot holes.

4.  Place the antenna in the bracket, and 

twist it clockwise to lock it in place. 

5.  Secure the antenna to the bracket with 

the included M3 set screw 

.

6.  Remove the backing from the adhesive 

pads 

 on the under-deck mounting 

bracket.

7.  Make sure that the bracket aligns with 

the pilot holes, and adhere the under-

deck mounting bracket to the surface.

8.  Using screws of the appropriate length, 

fasten the bracket to the surface.

9.  Connect a NMEA 2000 drop cable to the 

antenna 

.

10. If you are using an external cellular 

antenna (

page 5

), connect it to the 

GDL 40 antenna 

.

Summary of Contents for GDL 40

Page 1: ...xisting myGarmin account create an account 4 Click the link to register your product 5 Follow the on screen instructions After you successfully register and activate the antenna you then purchase a day pass directly from the chartplotter as needed Installing the GDL 40 Caution Always wear safety goggles ear protection and a dust mask when drilling cutting or sanding When drilling or cutting always...

Page 2: ... 1 Select a mounting location page 2 2 Temporarily secure the antenna in the selected location 3 Test the antenna for correct operation on the chartplotter 4 If you experience interference with other electronics try a different location 5 Repeat steps 3 and 4 until you find a mounting location where the antenna operates correctly After you verify correct operation at the mounting location permanen...

Page 3: ...ics An outer diameter OD of 1 inch Threads that measure 14 threads per inch Note An external cellular antenna is not compatible with the pole mount bracket page 5 Mounting the Antenna with the Cable Routed Outside of the Pole 1 Select a mounting location for the antenna and verify correct operation at the mounting location page 2 2 Route a NMEA 2000 drop cable through the pole mount bracket 3 Plac...

Page 4: ...e NOTICE When choosing a location to install the under deck mounting bracket make sure the included screws are not too long for the surface thickness If the screws are not appropriate for the surface you must supply the correct length of M4 screws to avoid damage to the top of the mounting surface The antenna can be mounted under a fiberglass surface Because the antenna has difficulty acquiring ce...

Page 5: ...Certified Cellular Antennas Digital Antenna 295 PW 18 white multiband antenna Digital Antenna 861 CW 30 white multiband antenna Digital Antenna 861 CB 30 black multiband antenna Certified Cables and Connectors Digital Antenna PowerMax cable part number DA240 30NM SubMiniature version A SMA male to Mini UHF female RF connector adapter Bomar Interconnect part number 9316505 Amphenol Connex part numb...

Page 6: ...ist Group Function 126992 System Time and Date 126996 Product Information Receive 059392 ISO Acknowledgment 059904 ISO Request 060928 ISO Address Claim 126208 NMEA Command Request Acknowledge Group Function Weather Broadcast Information The GDL 40 receives the following weather features and provides them for display on compatible Garmin chartplotters The weather features are broadcast in set inter...

Page 7: ...i le brouillage est susceptible d en compromettre le fonctionnement Radiofrequency Radiation Exposure Information This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment This equipment should be installed and operated with minimum distance of 7 9 in 20 cm between the radiator and your body This transmitter must not be co located or operating in conjunct...

Page 8: ...r operations of the Weather Data in connection with any products systems applications or hardware other than devices manufactured by or for Garmin BSD License This product may include source code from lwIP lwIP is licensed under the BSD license Copyright c 2001 2004 Swedish Institute of Computer Science All rights reserved Redistribution and use in source and binary forms with or without modificat...

Page 9: ...receipt which is required as the proof of purchase for warranty repairs Write the tracking number clearly on the outside of the package Send the device freight charges prepaid to any Garmin warranty service station Online Auction Purchases Products purchased through online auctions are not eligible for rebates or other special offers from Garmin warranty coverage Online auction confirmations are no...

Page 10: ...te at www garmin com 2010 2011 Garmin Ltd or its subsidiaries Garmin International Inc 1200 East 151st Street Olathe Kansas 66062 USA Garmin Europe Ltd Liberty House Hounsdown Business Park Southampton Hampshire SO40 9LR UK Garmin Corporation No 68 Zhangshu 2nd Road Xizhi Dist New Taipei City 221 Taiwan R O C www garmin com ...

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