Yes, I have 2 point one antennas. I don't blog often, but hope this will help some of you maximizing your electronics. Hope the lengthy explanation won't make you mad of me...

Let me explain how are mine working with each other.
My equipments: HDS 12 Touch at console; Elite 7DHI and HDS 5 Gen2 at bow; (1) Point 1 antenna right above trolling motor transducer; (1) Point 1 antenna on the back above the LSS 2 transducer

The reason I have 2 Point 1 antennas (you don't have to, but accuracy is everything to me so to each his own) is because here is an example to explain:
18' bass boat>>>most people would have one Point 1 antenna mounted by the console or about the middle of the boat (about 9' from front transducer and 9' from back transducer). Now assuming you are heading straight North and run over the top of a small but productive brushpile and mark it. You actually marked 9' north of your brushpile. Now next time you are approaching the brushpile from the North heading South using the same graph at the console >>>when you thought you have arrived at your waypoint according to the antenna, you won't see anything on the graph for another 18'. Now that's not really that bad assuming you are heading straight South, your brushpile will show up a few seconds. But what if you are approaching the brushpile from other angle, you will always be off at least 9' or more, and it can be frustrating at times.
Since I have (2) antennas with each mounted right on top of the transducer, it doesn't matter which direction I will approach the brushpile, it will always be right on top of it. Not only that, it doesn't matter if I approach the brushpile with the big motor and view from my HDS 12 touch or using my trolling motor and view from my Elite 7HDI, it will always be accurate from any direction.
Now... Here is the reason why I have an Elite 7HDI and a HDS 5 Gen2 mounted at the bow:
Elite 7HDI has AWESOME Downscan imaging. Yes, even better than my 12 Touch (Elite 7 Downscan works better than 12 Touch at slow trolling motor speed. 12 Touch has good Downscan image only if you are moving 3-7 mph) so having a bigger HDS for downscaning to fish brushpile using the trolling motor is NOT necessarily (actually won't) better than the Elite 7DHI). But the Elite 7DHI has two FLAWS:
1) VERY slow processor (zoom in or zoom out on mapping takes 5secs to regenerate)
2) Elite 7DHI doesn't have yellow connector for ethernet network (can't share waypoint with 12 Touch)
To solve several issues and save a few bucks, I added a HDS 5 Gen2 with equally fast mapping like the 12 Touch (12 touch is a fancy Gen2). Zooming in and out is instance, thus, connecting ethernet yellow connector between the (2) Gen2 units so I can now share waypoints. The 12 Touch has its own Point 1 antenna on the back. The Elite 7DHI and the HDS 5 Gen2 are sharing a Point 1 antenna at the front via Nmea 2000.
As the result, I use the full 5 in from HDS 5 Gen2 for dedicated mapping (unless I wish to see side scan from the back transducer from time to time). I use the full 7 in of the Elite 7DHI and for Downscan imaging. Now any waypoint marked from any of the 3 units will share to All 3 and accurate with SPEED!!!!

Good fishing to all!!!

Thank you for the explanation! Tbh, that is the setup I am wanting to create, except think I will go with the 9 on the console. Forgot you had the HDS up front for the mapping. Even though we didn't run the 12, seemed it worked pretty good. Looking at the Minn Kota Power Drive TM, looks like they have the HDI transducer in them? for the Elite. Going to go ahead and mount the Elite7 up front, then once i get around to getting the HDS', get the Point-1s. Probably be this time next year, but might be calling you, CV, to help hook up. Was waiting to get better electronics once I got a newer boat, but after the house, I will have to get the new boat for myself as a retirement present!

Slabmesilly, you are right on all counts and I certainly wouldn't argue with anything you are doing. But, (isn't there always a but?) To save a lot of money, I use two 9 Touches to pretty much do what you are accomplishing. Being off 9' can be an issue and if I were fishing for money, might even consider. But, with sidescan and spotlight on my tm, I think I can accomplish what you are trying to do at far less expense and equipment. If I get within 9' of a brushpile, regardless of size, I'm going to be on it pretty quick.
Most of the structure I fish isn't that difficult to locate and I only use spotlight on occasion. I don't really like it but, it does have it's place. If I had it to do over, I'd probably trade it for sidescan other than the fact the transducer is much smaller with spotlight and for a tm that is always an issue.
I did have an Elite 7 and traded up to a 9 Touch on the bow for these same reasons.

Guess I forgot to mention. If you have a Point1, then you are using NEMA 2000 and adding a second Point 1 is very simple. Just plug it into your NEMA bus and select which Point 1 you want used by which HDS you want (console or bow). And if you are doing this I don't see a need for 'the yellow wire' or Ethernet on anything.

Okiebob,
Guess I kinda skipped out on how my system got together.
I have had the Elite for a couple of yrs now at the bow and the HB998c at the console.
Not HB fan, but used it gracefully. Then I finally sold the HB998c and could afford to replace it with the 12 Touch.
Since I could only afford one thing at a time, and I like the Downscan imaging on the Elite 7DHI better than any of the touch series anyway, I decided to keep my 7.
So in order to solve the Elite 7 slow processor, I was able to find a deal on the HDS 5 Gen2 w/ power cable for $300.
So basically, I couldn't afford much after I sold the HB998c and replaced with the 12 Touch... (I didn't just draw all this scheme diagram up and went out to purchase everything together at once. Have I could afforded (2) Touches (9 or 12), I probably would have done the conventional way...

mind if I inject a little "point" technology of my own here ?
my turtles are point one and point two
I hook them up with a few worms and such
they give me pretty clear visuals
and when it comes to signal speed
I use the point one as well
them there softshell turtles point faster than any turtle around I tell ya
sorry guys,,,,but I just had ta

I was kindof wondering that. If you have hooked to NMEA 2000, is there a reason to hook via ethernet?

Where did that "point-1" point you to catch them there trout?

I could do away with the ethernet on my case, but running the 2000 cable full length of the boat was more hassle on mine. Beside, I wanted fool proof. Ever have a setting changed or reset to default?
So if one doesn't mind to be off 9'-18' or have the Point 1 accidently reset to use the same instead of dedicated, then yes, one can do what some have suggested above..

PM sent Happy. Wish I'd seen this before responding, I didn't understand you now have the 5 and not the Elite. Still not sure I'd change my answer but, maybe.

I have a 7 and 10, both gen 1. Would point 1 work, or would I have to upgrade? I have heard it both ways.

I have a HDS 8 Gen 1 and the Point 1 works great on it.

I may be missing the POINT
The POINT 1 major advantage is the fact that it has a flux gate compass built in. This feature allows you to always have the bow of the boat pointed toward the waypoint. Unlike when using a standard GPS antenna the map does not spin as you change position as relates to the waypoint.

In think the fact that it pings to the satellite faster is the major advantage. The curser on the map stays way closer to where you actually are and the curser also moves fluidly, instead of the jerky movements that it had before I installed the Point1 due to faster response to the sat.

I do like the compass feature, but not as much as being able to mark waypoints accurately and get back on them.

If you use the Point 1 to stay on structure or a brush pille it is much easier than with say the LGC4000. You can point the bow at the brush pile and use the distance rings to get in casting distance. No need to use marker buoys. This is a function of the compass.