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Simrad / N2K / SimNet Wiring Check

Old 09-03-2017, 05:31 PM
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Default Simrad / N2K / SimNet Wiring Check

I've been unable to acquire a Simrad Systems Builder diagram from the vendor I purchased my equipment from, so I'm hoping for some experienced eyes to critique what I've come up with. Diagram is attached.

The layout in the attached diagram keeps wire routing to a minimum, which helps quite a bit in my case given very limited access between overhead console, the helm and below decks. However, it makes two assumptions I'm not sure are correct.

- 4G Simrad RADAR cable would need to be shortened significantly. Resulting cable would be about 10'. I'm skilled with and have proper tools for a new RJ45 connector.

- Two items (Simrad GoFree Wifi and RI110 RADAR interface box) require ethernet. There are two ethernet ports on the back of the nss12 evo2, however there are also two ethernet ports on the GoFree Wifi unit. Given its proximity to the RI110, daisy chaining as shown in the diagram would save me a ton of grief as opposed to wiring both of these to the MFD...but it is "allowed"?

Thanks for any feedback.
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Old 09-03-2017, 06:23 PM
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I don't see any issues.
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Old 09-03-2017, 07:13 PM
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Thanks, Brian.
Old 09-03-2017, 07:43 PM
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Simrad recommends not using the gofree as a pass-through.
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Old 09-03-2017, 07:54 PM
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Originally Posted by MikeBador View Post
Simrad recommends not using the gofree as a pass-through.
Thanks, Mike.

It's probably possible to run another ethernet from the MFD to the gofree in the overhead, but it will be very tight and much tidier as as shown. That would be a "cussin' necessary" option.

Another option that avoids the limited wiring space between MFD and overhead console is to mount the gofree somewhere other than the overhead...but I wanted it up high for best reception. Maybe not necessary on a 26' boat, and it would be easy and clean to mount it below decks - perhaps I'll play around with that a bit before buttoning everything back up.
Old 09-04-2017, 04:47 AM
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Put WiFi-1 at the backside of the helm, you will have excellent signal quality all over a 26' from such a position.

Using both ports on WiFi-1 may in some cases give Ethernet issues.
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Old 09-05-2017, 09:37 AM
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Originally Posted by abbor View Post
Put WiFi-1 at the backside of the helm, you will have excellent signal quality all over a 26' from such a position.

Using both ports on WiFi-1 may in some cases give Ethernet issues.
Great idea - thanks! I've a short shelf that is being finished that the MFD will sit on, and there's just enough room behind it for the GoFree. It's nearly invisible there unless viewed from the side, and of course - wiring is easy.

Some additional research/reading on the topic makes clear using the Gofree for pass through to the RI10 isn't wise for several reasons. Potential compatibility issues being one, but far more important to me - it adds a single point of failure that would not otherwise exist for the RADAR. That's a risk I'm glad to avoid. Thanks again for all the help.

Next up - where to place the RC42N rate compass. Instructions say to keep it 6' away from the engine, but that ain't gonna happen. One seemingly decent location is about 4' away on the other side of a bulkhead, tucked underneath the freshwater tank support. It's not centered on the boat side-to-side, but fore-aft is pretty well centered and it's within 6" of the waterline. Also, no electrical of any kind nearby - so I'm hopeful there's no significant interference from anything there.

How sensitive is the RC42N to the various types of interference? Are some of them (large metallic items, heavy electrical loads) more critical to avoid?

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