GPS & VHF - GPS Position.. is this wired correctly?

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Trying to help a friend who connected his Garmin GPSMAP 551 to his Garmin VHF 100i.

Here are the connections.
Starting with the VHF, then extension wires, then the GPS....

[VHF] Gray (NMEA IN -) : EXTENSION CABLE : Gray (P2TXD)
[VHF] Purple (NMEA IN +) : EXTENSION CABLE : Violet (P2RXD)
[VHF] Blue (NMEA OUT -) : EXTENSION CABLE : Blue (P1TXD)
[VHF] Brown (NMEA OUT +) : EXTENSION CABLE : Brown (P1RXD)

I have included below some pics
VHF going into Extension lead. The VHF cable is below, and the extension lead is above

Extension lead and GPS. The Extension lead is on top, GPS lead on bottom

I didn't wire this. There is no GPS info showing up on the VHF 100i. I cannot see where I need to enable this on the VHF menu. I do see on the Garmin VHF manual you can choose NMEA 0183 / 2000, but it says this is for teh VHF 200i and I confirm there is no choice to choose either 0183 / 2000 on the 100i.

Am I missing something? I'm wondering does it have to be a special type of cable (incase there could be a resistance issue) - I didn't have any tools with me so couldn't check the resistance across the connectors (also to make sure that the connections are crimped properly)

Any assistance much appreciated!

PS. Manual for VHF: http://static.garmincdn.com/pumac/VHF_100_200_Series_OM_EN.pdf
Manual for GPS: http://static.garmincdn.com/pumac/GPSMAP_4x1_5x1_5x6_OM_WW_EN.pdf

PS. No comment about the state of the wiring please, I didn't do any of it!

 

[MoodySabre]

The VHF manual says that the 100i model only works on 0183. On page 35 it says in order to connect it to a GPS see the VHF 100i Installation Instructions. This is obviously not in the User Manual but a seperate document.

 

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The VHF manual says that the 100i model only works on 0183. On page 35 it says in order to connect it to a GPS see the VHF 100i Installation Instructions. This is obviously not in the User Manual but a seperate document.

Thanks. So the first port of call is to check that the GPS is outputting NMEA 0183

 

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According to this, am I right in saying that the wiring is wrong: http://cdn.cnetcontent.com/b5/74/b57468a3-c7f6-46cf-a839-71dfab136979.pdf

If i'm correct, the following should be done:
VHF Grey & Blue & Ground connected to same cable as GPS Ground
VHF Purple (NMEA in +) connected to GPS Blue (P1TXD)
VHF Brown (NMEA out +) connected to GPS Brown (P1RXD)

-EDIT- Scrap what I said above in this post. According to this: http://www.intermarine.gr/uplds/289_200i Installation instructions.pdf (Page 5)
It's just that the wires are the wrong way round. I'll give it a shot as per manual above next time i'm at the boat.

 

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Think I nailed it (if you can read my 5yo writing)

 

[scubaman]

Hi N,

Assuming that your friend only wishes to get the gps position into the VHF, my suggestion would be to connect the blue from the plotter into the purple in the VHF. Then connect the black from the plotter and grey from the vhf into a common ground. Ie. connect the grey from the vhf into one of the wires in the extension cable and then connect the other end into the black wire from the plotter (and make sure they are connected to ground).

As it is in your last drawing, you are feeding two separate nmea out (positive) sources from the plotter into the + and - input terminals of the vhf.

 

[alt]

Hi N,

Assuming that your friend only wishes to get the gps position into the VHF, my suggestion would be to connect the blue from the plotter into the purple in the VHF. Then connect the black from the plotter and grey from the vhf into a common ground. Ie. connect the grey from the vhf into one of the wires in the extension cable and then connect the other end into the black wire from the plotter (and make sure they are connected to ground).

As it is in your last drawing, you are feeding two separate nmea out (positive) sources from the plotter into the + and - input terminals of the vhf.

Thanks, K. I did wonder "Am I inputting 2 connections", but that's what it showed on the VHF installation manual. I will try the method in my drawing first (as they are connected with spade connectors, so will only take a few mins to check). If that doesn't work, your suggestion is Plan B

Thanks

 

[dan from bhg]

Hi N,

Assuming that your friend only wishes to get the gps position into the VHF, my suggestion would be to connect the blue from the plotter into the purple in the VHF. Then connect the black from the plotter and grey from the vhf into a common ground. Ie. connect the grey from the vhf into one of the wires in the extension cable and then connect the other end into the black wire from the plotter (and make sure they are connected to ground).

As it is in your last drawing, you are feeding two separate nmea out (positive) sources from the plotter into the + and - input terminals of the vhf.

Yes, this is correct. There's no need to connect the other wires.

 

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Yes, this is correct. There's no need to connect the other wires.

Many thanks to both of you for the advice. Looks like i'll bring some fresh cable, connectors etc. with me and do a fresh job on it for the guy, it was put together originally a bit messy imho