Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > Marine Electronics Forum
Reload this Page >

Sharing GPS Output with other Electronics

Notices

Sharing GPS Output with other Electronics

Old 01-12-2003, 05:56 AM
  #1  
MemberCaptains Club Member
Thread Starter
 
Join Date: Jan 2003
Location: Scotch Plains, NJ, USA
Posts: 88
Default Sharing GPS Output with other Electronics

I will be having the following equipment installed in my boat which all require a signal form the GPS antenna: Flo-scan 9000, Simrad AP14 Autopilot, Garmin 2006C Chartplotter, Furuno 1731 Radar, ICOM 502 VHF, Furuno 600L Fishfinder and a second VHF (Standard Horizon Spectrum). Will the 1 GPS antenna be able to supply the signal to all this equipment? How does the equipment need to be interconnected to optimize all the features and performance? How many NEMA cables are required? Should a second GPS antenna be added?
Any help or comments are appreciated.
Thanks,
CalicoJim
CalicoJim is offline  
Old 01-12-2003, 07:45 AM
  #2  
Senior MemberCaptains Club Member
 
Join Date: Dec 2002
Location: Orlando
Posts: 3,997
Default Sharing GPS Output with other Electronics

The Garmin unit itself will be the NEMA source for all the others. It has a NEMA output that will be fed to all the others NEMA input.

The antenna only serves the Garmin.
Sea_Dad is offline  
Old 01-12-2003, 09:56 AM
  #3  
MemberCaptains Club Member
Thread Starter
 
Join Date: Jan 2003
Location: Scotch Plains, NJ, USA
Posts: 88
Default Sharing GPS Output with other Electronics

Are their any problems with having the Garmin with the one GPS antenna sending the signal to this much other equipment? Are their enough output ports on the Garmin unit or is their some kind of splitter box to accomodate the multiple connections?
CalicoJim is offline  
Old 01-12-2003, 10:17 AM
  #4  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Default Sharing GPS Output with other Electronics

In general Garmin will tell you that their GPS units are capable of driving (talking to) up to 4 devices (listeners). This is a voltage driven limitation so it is possible to hook up more if you keep the wires as short as possible and make sure all of your connections are of very low resistance (solder).

When you have to many on there its not like all but one thing will work, what happens is that if you have to much demand on the circuit all of them will quit (or not work in the first place actually).

In your case you may find that you'll be better off getting a second GPS (a hand held is what I use for this) and driving some of your stuff off of it. I use a Garmin GPSMap-76 as my second GPS and have it hooked up to my backup VHF (with DSC) and also use it to feed my location to the fish finder. I use my main GPS (2006) to feed the main radio, the auto pilot, and the radar. I run them all off of the boat's power supply but have them wired independently so that if one circuit fails I will still have the second GPS and radio available.

For whatever its worth I also use a home-made junction box to do all of my NMEA interface. Every device simply goes to a lug in the box and then I use jumper wires to connect one device to another. I have a picture of how this looks and I'll come back in a bit and edit this to show you what a wireing nightmare looks like.

Thom

"For every complex question, there's a simple answer. And it's wrong."
(--H. L. Mencken)
Thom is offline  
Old 01-12-2003, 10:37 AM
  #5  
Senior MemberCaptains Club Member
 
Join Date: Dec 2002
Location: Orlando
Posts: 3,997
Default Sharing GPS Output with other Electronics

The Garmin antenna will not be the sender. It only hooks to the Garmin unit, the unit interprets the antenna's signals and then transmits that interpretation out on the NEMA output for the listeners.
You can have a marina/outfitter hook up a repeater if needed. This will help in driving a lot of listeners.

As Thom pointed out, redundancy is a good thing on critical equipment. Having 2 GPS's is always wise. I personally carry a handheld, but I only output NEMA to my vhf.
Sea_Dad is offline  
Old 01-12-2003, 10:40 AM
  #6  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Default Sharing GPS Output with other Electronics

Here's what it looks like:



Thom

"For every complex question, there's a simple answer. And it's wrong."
(--H. L. Mencken)
Thom is offline  
Old 01-12-2003, 10:43 AM
  #7  
Senior MemberCaptains Club Member
 
Join Date: Dec 2002
Location: Orlando
Posts: 3,997
Default Sharing GPS Output with other Electronics

Finally, a reason for having tuppaware.
Sea_Dad is offline  
Old 01-12-2003, 11:13 AM
  #8  
Senior MemberCaptains Club Member
 
Join Date: Aug 2002
Location:
Posts: 308
Default Sharing GPS Output with other Electronics

Thom, Did you get a kitchen pass to take that tupperware out of the house and use it in your boat?
tex4771 is offline  
Old 01-12-2003, 11:31 AM
  #9  
Senior Member
 
Join Date: Apr 2002
Location: Mass.
Posts: 924
Default Sharing GPS Output with other Electronics

The Garmin 2006C has two NMEA outputs, so you should be okay if you split up the devices between the two. In the bundle of wires from the power/data cable, the blue is Port 1 and the gray is Port 2. All use the common black ground. You will need to set up the communications protocol to the correct NMEA version and sentences using the Com menu.

The Furuno devices will each require a Furuno NMEA data cable. You could connect the NMEA output from the fishfinder to the Garmin Port 2 data in (purple wire) and display depth on the Garmin. This is a good feature if you fish because the depth data will be saved along with position when you save a mark.

Otherwise all the connections are to permit position and/or speed data to get to something that can either serve as a data repeater (radar for example) or that needs it for a calculation (Floscan using speed data to calculate mpg) I believe the other devices can all be connected using standard two wire cable.

As Thom said, the shorter the wires, the better. A bus (or two in your case) is a good idea when you have this many devices sharing the signal.

[This message was edited by Saltdog on 01-12-03 at 02:41 PM.]
Saltdog is offline  
Old 01-12-2003, 11:43 AM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Default Sharing GPS Output with other Electronics

One of the things I love about the local Wal Mart is the variety of Tupperware available there. If you can think up a use for the stuff they will have what you need. I have this interface box made up of it, my battery charger is mounted inside a tupperware box, and so is my wash down pump. Wire them up, seal the holes with 5200 (which won't stick to tupperware by the way) snap on the lid and it will live for years. Good stuff

Thom

"For every complex question, there's a simple answer. And it's wrong."
(--H. L. Mencken)
Thom is offline  
Old 01-12-2003, 01:02 PM
  #11  
Senior MemberCaptains Club Member
 
Join Date: Apr 2001
Location: Northern California
Posts: 277
Default Sharing GPS Output with other Electronics

Saltdog:
I am pretty sure you can only use one of the ports for putting out nema info. I don't have my manual here But I think one is for input from a sonar. i just checked the install manual at garmin and port 2 is the only one for nema data. Gray wire=Data out
Violet=data in

JOHN
SPORT-CRAFT 252
john sturdivant is offline  
Old 01-12-2003, 02:22 PM
  #12  
Senior Member
 
Join Date: Apr 2002
Location: Mass.
Posts: 924
Default Sharing GPS Output with other Electronics

If you look at the installation manual's wiring diagram, it shows Port 3 for the sounder and Port 1 as having data in and data out. Port 1 is normally used for the serial port connnection to a computer to upload and download waypoints, but I believe it can also transmit the NMEA data.

I think mine is set up this way (two outputs), but I can't go check because it's too cold! I also have the problem of needing multiple feeds for my two radios, sounder, autopilot, and Yamaha fuel management gauge.
Saltdog is offline  
Old 01-13-2003, 09:25 AM
  #13  
Senior MemberCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,755
Default Sharing GPS Output with other Electronics

Thom,
Doesn't your battery charger get to hot being sealed?

Birdman, Capt of
Birdman is offline  
Old 01-13-2003, 01:35 PM
  #14  
Senior Member
 
Join Date: Apr 2002
Location: Mass.
Posts: 924
Default Sharing GPS Output with other Electronics

I did go check -- look on pages 69-70 of the Garmin 2006C manual and you will see that Port 1 can also be configured as a standard NMEA "talker" to supply data to other devices, so there are two outputs.
Saltdog is offline  
Old 01-13-2003, 02:03 PM
  #15  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Default Sharing GPS Output with other Electronics

Actually mine doesn't get very warm at all. As you know I leave the charger plugged in almost all of the time and it is warm to the touch but that's all, just warm. With it I don't leave the lid on the box though, its just got the tupperware box itself to act as a splash shield more than anything else. I do have the lid for it right in the cubby hole where its located so I can stick it on, and I do sometimes, but for the most part its left open. The wash down, on the other hand, is sealed completely and so is the electronics interface box. By sealed I mean I have 5200 where the wires (and hoses) come into and out of the boxes and I keep the lids on.

I know the tupperware sounds a bit silly, and maybe it does no particular good, but it makes me feel better and for three or four bucks why not?

Thom

"For every complex question, there's a simple answer. And it's wrong."
(--H. L. Mencken)
Thom is offline  
Old 01-13-2003, 02:15 PM
  #16  
Senior MemberCaptains Club Member
 
Join Date: Apr 2001
Location: Northern California
Posts: 277
Default Sharing GPS Output with other Electronics

Saltdog- Thanks for letting me know that!!! I really thought port 2 was the only port for interfacing. I was supplying 3 devices and I thought it was maxed out. Now maybe I can hook up my radio to the other port, Thanks again!!!!

JOHN
SPORT-CRAFT 252
john sturdivant is offline  
Old 01-13-2003, 02:45 PM
  #17  
Senior MemberCaptains Club Member Admiral's Club Member
THT sponsor
 
Join Date: May 2002
Location: Brookhaven, LI, NY
Posts: 15,755
Default Sharing GPS Output with other Electronics

I have been looking long and hard for a good water-tight accessable (can be opened and closed easily) box for several projects (marine and non) for a long time. Everyone keeps directing me to electronics parts distributors and the little project boxes made out of metal, yeah right? that'l last about a 1/2 hour in the salt water!!

Tupperware, I think you have something there!! Why not seal with regular sylicon? does it not stick either?

Gotcha on the heat, my charger gets pretty hot and clearly states in manual and on the front of the thing, "DON'T ENCLOSE, needs breathing room....", that was why I asked.

Anywho, off to Grand Union for my marine electronics and a loaf of bread!!

Birdman, Capt of
Birdman is offline  
Old 11-22-2003, 08:46 PM
  #18  
Senior Member
 
Join Date: Nov 2003
Location: Diamond Bar, Ca.
Posts: 215
Default Sharing GPS Output with other Electronics

Just installed a Garmin 2006 today. Port 2 is dedicated to NMEA. Port 1 defaults to serial for computer communications, but it can be changed over to NMEA.

Nice Tupperware there Thom. I knew you did it, just never saw the picture. Cool.

A company called Bud Industries makes gasketed NEMA 4X waterproof plastic boxes in all kinds of configurations--even clear tops. I use those with terminal blocks inside for NMEA junction boxes. Mouser electronics carries bud boxes. They're on the net.

http://www.mouser.com/index.cfm?hand...ma*%2b*4x*&N=0

Kman

*
Kman is offline  
Old 11-23-2003, 05:22 AM
  #19  
Senior MemberCaptains Club Member
 
Join Date: Feb 2001
Location: West Virginia
Posts: 3,877
Default Sharing GPS Output with other Electronics

Wow!

K-Man, welcome to The Hull Truth. I hope you stop by here regularly, very much hope so.

Folks, for those of you who have not had the good fortune to run across K-Man before I expect you'll be mighty happy if he sticks around. He knows more about electrical systems and soes the cleanest neatest work you are likely to run across anywhere. If you are doing any installing, or rewireing, or any similar work try to find one of the pictures of something similar that he has installed. I will absolutly guarantee you that you will learn from every single one of them you see. The best!

Thom
Thom is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread