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That is not the 9 M SIDB Y cable, it is the 9 M360 2DDI Y cable.
It connects a MEGA 360 and Humminbird 7 pin transducer to a Helix.

Both 360's (original and MEGA) are rotating Side Imaging transducers= a left and right SI piezo. As the transducer rotates it replaces one side with the other. If you have a blackout on either side,...

When it doesn't bounce off a frozen surface.

Bass Buster: Scorpion and Tarantula

Display Full, Front, Rear, Left, and Right use both piezos and do the 360 rotation.

Your results reflects your preparation. Read post #2 here----Installation & Networking Information Resource (bbcboards.net)
Add to that to make sure the shoot-thru works before doing the above by...

Should not make any difference what the Display setting is, a failed piezo would do the same for all of them.

Current Repair Fees – Humminbird (johnsonoutdoors.com)

2D/Depth with your installation comes from the shoot-thru all the time. Depth comes from the center of the 2D pulse for all views.

SI and DI do Range.

How did the shoot-thru do when you did the...

Turn on a SI view and use the MEGA 360 for SI and you will see which piezo has failed (left or right).

If you lose the image with the Front view, you have a defective 360.

Supposed to look like this all the time:

https://i.postimg.cc/5tCq10Tq/S00039.png

If you use Isolate Sweep Area and set the coverage area and direction, the transducer sweeps back and forth like a vehicle windshield wiper.

If you use Display, that gives you 360, or Front, or...

The LIVE has to be recognized as CONNECTED and its serial number and software version shown in the Accessory Test menu to do an update. AND you cannot reload the software.

What software version do the Helix G3N's have?

The G1/G2 file is 93.5 MB larger than the G3.

No, the G3 software is a different file and smaller than the one for G1 and G2, just same version number.

No, you cannot use Heading separate from GPS with Helix units.

Your statement "All networked together via Y cables and the network switch" is not possible since there is no such thing as a network Y cable.
That is why this thread got sidetracked.

There are...

The units have software and the MEGA LIVE has software. You update the units first and then use one of them to update the LIVE.

The LIVE update can be done with a Helix, SOLIX, or APEX. It's the...

I have used this company to do alignment for a boat trailer. Been many years ago though. Call to see if they still do.

Auto Repair & Mechanic Shop Charlottesville, VA Albemarle County Surrounding...

Read post #19.

My max speed is 7 mph. 9.9 HP for HP restricted lakes.

It's the perspective--the SOLIX is about 1' forward of the Helix.

https://i.postimg.cc/CLGk1hHQ/20210904-165343.jpg

No. You only choices are in the VIEWS list. In no case can a custom view be created with Helix units.

SOLIX and APEX can have custom views created---