NMEA 2000 Bus R27OB

[Rebel112r]

I would like to switch the power to the bus. If it is switched, I have not yet found. Auto pilot ccu stays powered with everything off. I have not found a drawing showing where Ranger is connecting power to bus. Anyone have suggestions? Thanks Dan

 

[bobmastors]

I was just looking at this on my R27OB.

On my boat at least, there is a yellow cable to the NMEA 2000 bus (access from the head).
I believe that is Garmin NMEA 2000 power cable.

There is a fuse labeled NMEA Power (access from the head) that might provide a convenient place to tie in a switch.
I think that entire fuse block is switched from the House switch in the cave (just a guess).

 

[Submariner]

I would like to switch the power to the bus. If it is switched, I have not yet found. Auto pilot ccu stays powered with everything off. I have not found a drawing showing where Ranger is connecting power to bus. Anyone have suggestions? Thanks Dan

On the RT27-OB, the Nema2000 bus is powered directly off the distribution panel behind the helm (bathroom mirror).
It's on the switched side of the DC switch, meaning, if you turn off "DC" power via the big switch in the cave (House battery off switch), it will lose power.

But there is no individual switch to turn off just the N2k bus. It's a 10amp fuse located on Fuse Block B, behind the mirror.

 

[Rebel112r]

Hey thanks all, found the wire and see where it goes into fuse panel. Think I will switch it, with switch on upper right side of the chart plotter. Don’t know what the draw is, but there are several things on the bus using power. Granddaughter crawling around in the cave, brought my attention to the flashing green light. New boat to me, hasn’t hit the water yet, sitting on trailer, maybe tomorrow. Shout out to Martin for all the good videos, thanks. Also my boat was the one with dinghy lift at the foot of your dock.

 

[Submariner]

Hey thanks all, found the wire and see where it goes into fuse panel. Think I will switch it, with switch on upper right side of the chart plotter. Don’t know what the draw is, but there are several things on the bus using power. Granddaughter crawling around in the cave, brought my attention to the flashing green light. New boat to me, hasn’t hit the water yet, sitting on trailer, maybe tomorrow. Shout out to Martin for all the good videos, thanks. Also my boat was the one with dinghy lift at the foot of your dock.

I measured it using battery monitor and saw 2 watts. Most of the devices connected are powered off when the boat's not in use. I need to re-measure mine again since I've added a few things which are actually on 24x7.

I upgraded my N2k network. I've got the T which provides power. On each side of that I put in a multi-port (4 port) T to shorten up the bus. I ran out of room.

Factory setup:
* Terminator
* Reactor (auto pilot)
* VHF Radio
* Garmin 8612 Chartplotter
* 12volt Power
* GHC20 (autopilot display)
* Yamaha Engine
* Fusion Radio
* Terminator

I've since added:
GPS 24XD (GPS receiver)
AIS (Vesper XB8000)
Lenco Autoglide

Here's my upgraded N2k bus.
https://www.letsgochannelsurfing.co...kxcqzo6u-e61f02e3-39a2-43e9-bb4d-e790fe46cb37

And I have plenty of room now to add more. 🙂
https://www.letsgochannelsurfing.co...kxcqzo6u-96b94cc8-82c1-4af2-9717-d5610510373c

Here's a work-in-progress picture.
https://www.letsgochannelsurfing.co...kxcqzo6u-d87ff1f6-d6dd-4784-9eaa-2b672002ad63

Thanks for watching our videos!! What's your boat's name? Anna D I suspect. 🙂

 

[Rebel112r]

Correct on the name. Is that a whole new 2000 backbone on your boat or did you just add to the end of it. My knowledge on that stuff is rudimentary, and is it powered in more than 1 place, or is that necessary?

 

[Submariner]

Correct on the name. Is that a whole new 2000 backbone on your boat or did you just add to the end of it. My knowledge on that stuff is rudimentary, and is it powered in more than 1 place, or is that necessary?

The original N2k bus was comprised of 6 individual T's. I replaced 8 individual T's with two 4 port multi-T's that take up less horizontal space due to the devices I added.

Not all devices that connect to the N2k bus require power, but some do. The N2k is just a network that lets devices share information. The VHF radio and Garmin Chartplotter work great individually. Connecting them together via the N2k bus lets the VHF radio pick up GPS positioning data that it can then use for it's DSC function (to send a distress call over VHF announcing your exact GPS position). Neither of these functions would require power from the N2k bus.

As an example, I then added a Garmin GPS 24XD GPS receiver. It's not just an antenna, but an actual GPS receiver with a built in heading sensor. It requires power to operate. It gets that power via the N2k bus. This took my GPS accuracy on my chart plotter from +10 ft down to +3 ft. The VHF radio and Garmin chartplotter are able to use the GPS positioning data from the GPS 24XD receiver via N2k.

The N2k bus on a factory setup does not draw a significant amount of power.

 

[gregc]

As an example, I then added a Garmin GPS 24XD GPS receiver. It's not just an antenna, but an actual GPS receiver with a built in heading sensor. It requires power to operate. It gets that power via the N2k bus. This took my GPS accuracy on my chart plotter from +10 ft down to +3 ft. The VHF radio and Garmin chartplotter are able to use the GPS positioning data from the GPS 24XD receiver via N2k.

I just picked up a 24XD as well.... looking forward to trying to figure out how to get that installed.

 

[Submariner]

As an example, I then added a Garmin GPS 24XD GPS receiver. It's not just an antenna, but an actual GPS receiver with a built in heading sensor. It requires power to operate. It gets that power via the N2k bus. This took my GPS accuracy on my chart plotter from +10 ft down to +3 ft. The VHF radio and Garmin chartplotter are able to use the GPS positioning data from the GPS 24XD receiver via N2k.

I just picked up a 24XD as well.... looking forward to trying to figure out how to get that installed.

I published my install of the GPS 24XD here. It's worked out FANTASTIC. I have a GPS error of under 4 feet.

https://www.letsgochannelsurfing.com/gps-external-antenna

 

[dexmot74]

How do you tell the devices on the nmea network which gps to use? I assume the built in and 24xd both will broadcast data.

Sent from my Pixel 6 Pro using Tapatalk

 

[Submariner]

How do you tell the devices on the nmea network which gps to use? I assume the built in and 24xd both will broadcast data.

Sent from my Pixel 6 Pro using Tapatalk

Ona standard horizon radio you go into configuration, n2k v click search… it’ll find everything. Then select the gps24xd.


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[dexmot74]

What about other devices like AP, auto trim tabs that could use gps? Just curious if nmea has a standard for prioritizing with conflicting devices.

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[Submariner]

What about other devices like AP, auto trim tabs that could use gps? Just curious if nmea has a standard for prioritizing with conflicting devices.

Sent from my Pixel 6 Pro using Tapatalk

I went into the config on my chartplotter and told it to not use its own gps. Only use gps from N2k. The gps24xd will show up as an option to use.

The vhf radio will auto pick gps unless I tell it which to use.

Autoglide and autopilot just have to pick. I would assume they’d take the gps signal with the best accuracy.

I have 3 gps receivers. The chartplotter, the vesper AIS and the gps24xd. All of which will broadcast their gps info onto n2k. I shut off the chartplotter from doing this. So gps is only put onto n2k from the vesper AIS and from the gps 24xd. Due to location of install, the gps 24xd is always the most accurate.

Incidentally, make sure you calibrate the heading sensor on your gps24xd. I did not and found out that AIS will take heading direction from the gps24xd. I was showing up on other boats via AIS doing 25 knots traveling due north but my boat was facing due west. It looked like I was cruising sideways.


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[dexmot74]

Thanks Martin!

I'm adding an AIS 800 w/ GPS Antenna, Rudder Indicator and the 24xd GPS Antenna. Already have the usual of Plotter, AP, Auto Tabs, VHF, Fusion etc.

Shall be interesting to see how the system handles it.

 

[dbsea]

Thanks Martin!

I'm adding an AIS 800 w/ GPS Antenna, Rudder Indicator and the 24xd GPS Antenna. Already have the usual of Plotter, AP, Auto Tabs, VHF, Fusion etc.

Shall be interesting to see how the system handles it.

Care to share how you’re installing the rudder angle indicator? Feel free to PM so I’m not taking over this thread. 🙂

 

[dexmot74]

Thanks Martin!

I'm adding an AIS 800 w/ GPS Antenna, Rudder Indicator and the 24xd GPS Antenna. Already have the usual of Plotter, AP, Auto Tabs, VHF, Fusion etc.

Shall be interesting to see how the system handles it.

Care to share how you’re installing the rudder angle indicator? Feel free to PM so I’m not taking over this thread. 🙂

I'll let you know when it's done. I'm not doing that one myself.

Sent from my Pixel 6 Pro using Tapatalk

 

[Submariner]

Thanks Martin!

I'm adding an AIS 800 w/ GPS Antenna, Rudder Indicator and the 24xd GPS Antenna. Already have the usual of Plotter, AP, Auto Tabs, VHF, Fusion etc.

Shall be interesting to see how the system handles it.

It'll handle it just fine.

Here's the drawing of my N2k network.
https://www.letsgochannelsurfing.com/_files/ugd/b6c9c0_85ed9b5348034e1bb49f441d5bba5227.pdf

 

[dexmot74]

The 24xd install went super smooth and found the spot to disable built in GPS. Fishing the cable was super fast, sometimes the cable fish god is nice 😀

Getting around 5ft accuracy now.