Build your own Garmin GMS 10 Marine Network Port Expander DIY $110 - Save $240 over the Garmin Hub! 

Thanks for sharing, I bought NETGEAR GS 308 8 PORT Gigabit Ethernet Switch. 12vdc@ .5amps Output. Just cut off the AC transducer. Then Add an inline fuse to your battery connection. Again thanks for sharing and saving money also.👍🏻👍🏻👍🏻🎣🎣

Not a bad video demo for the nerdy fisherman. Just update your Ethernet switch for a shielded model as it’s a requirement for Garmin to reduce noise and to turn Garmin devices on/off. The original Garmin equipment is also bonded to the negative to eliminate ground loops and doesn’t void your warranty. Nothing wrong with making cables but I’d shy away from home built switches if you have a lot invested. You can absolutely save money doing this but you need to use a shielded switch to gain full functionality out of Garmin. Cat5e shielded is all you need too if that’s cheaper. 👍👍

Man you just saved my night, i already have a 93sv with just live scope and tonight bought a 93sv with the gt56uhd transducer just to realize i needed a hub. Me being a computer guy this is an easy fix what you have outlined. Thank you so much!!!

For anybody looking to do this, you can get VERY cheaply get USB powered network switches. Having just snagged two $299 Echomap 74xsv from West Marine (crazy sale), I just bought a 3 port on Amazon for seven bucks, and plugged it into an SAE 12v to USB phone charger I already had on hand. Plugged in my LiveScope black box (the OG, from my icefishing rig) and it works a treat. For what it is worth, cables don't seem to matter; I tried one crossover cable and one regular old cat6 cable, and both seem to work great.

I was thinking back about this build wanted to let everyone know about the ethernet cables. Making the cables "waterproof" is the most difficult part of the whole job because its difficult to physically fit the cat 7 cable through the waterproof connector and the plug end. But by going with those cat 7 cable I found it provided a lot of the things Garmin indicated their wires have including, the shielding, drain wire, and a UV/water resistant coating. If you've never made ethernet cables make sure to straighten out the twisted pairs to make fitting them into the plug easier and be sure none of the wires move on you before you crimp the plug onto the wire otherwise you'll have to cut it off and start again. Like I said it can be tough but it is still very doable. I had a wire slip on me when crimping them and I've made many ethernet cables before, so don't get discouraged.

Just did this with the 12v/8 port and no crossover cables and works just fine.

This is great! I just got two units which are the 93sv uhd and also a livescope setup. When I knew I had to buy another expensive item to have them network i was upset. I'm going to try this. Thanks for helping man.

Netgear gigabit switches use 12v. Probably need to stabilise the voltage though so you probably need a voltage stabiliser anyway

Are you sure you need crossover cables? These are only required usually if there is no switch. Most switches detect if crossover is required and do the required business anyway... I note a comment further down stating crossovers were not required...

I noticed that you said it’s cross connected which end is Side A configuration & which end does side B configuration go to (I.e, Side A- Garmin unit, Side B-Network Switch )

Thanks for this video!

This is a pretty cool idea and came out nice - thanks for sharing!

This is an amazing DIY project, thanks so much for sharing. I wonder if it’s possible to do the same for that $1k Garmin switch device that connects to you Garmin panel to control bilge pumps, lights, horns..etc?

I have the same setup, except with no buck converter. I used a 12v network switch (not 5 volt) and didn't use the AC adaptor, just wired it to the battery. I realize you used it to go from 24v system, but your screens are wired off a 12V battery anyway so why not use that & save on the converter? Plus a network switch uses very little power. Nice tutorial BTW it will help lots of people save some money.

Thanks! I'm not getting scammed on these already overpriced fishing electronics

You are smart I was thinking about this and you showed me it is possible thank you

So I'm going to spend 2-3k on 2 graphs, 1500 on live scope, 3500 on a trolling motor but when I see 249.00 for the switch and a 100.00 for some cables, that's going to be the deal breaker? Don't get me wrong this is a great tutorial and looks like a fun little DIY project but I feel like if you're going to make this kind of investment, just bite the bullet and do it right. The last thing you want is to blow up an expensive piece of equipment and have the manufacturer deny you warranty because you wanted to save 200.00 on a 8k spend, lol.

Great information, thanks for sharing, you encouraged me to give it a try. I just received my order from amazon and are ready to get started. You shared that you cut the block from the power cord of the network switch and plug the ends into the out put side of the converter but ware did the wires come from that you pluged into the input side of the converter?

I got this tp link and it doesn’t work , I do have the gls10 on own power and that’s it , any ideas I can try?

Is all functions working with a standard switch? Such as power on the radar from the mfd?

Do you know if a sonar-less fishfinder requires the sonar-ed fishfinder to be powered on to access that sonar when networked together?

Great video, thank you for sharing. How long have you been using it? What type of battery did you connect?

So that voltage step down box also converts dc to ac? I thought the network box was looking for AC? Yes, I know nothing about electricity. I thought it was needing 110v of AC?

How many of the garmin network cable connectors would I need for 2 echo map 93sv UHD and livescope to be networked?

Do you have a connection diagram you can share? I see 3 purple cat7 cables connected to the switch. I know the Livescope has 1 coming in (black), 1 for each of 2 screens but not sure what the 3rd is for.

So did you cut the ends off each bought cable and re tip with shown diagram ..?

Can you just use a waterproof outdoor ethernet switch?

Does this unit also work for ps22 transducer

Are you sure that the cables need to be crossover? I don't understand why they couldn't be a standard A or B straight through if you're using a normal switch. I wonder if they are really supposed to be straight through cables and that little switch supported MDI/MIDX detection. I need to test this...