Have just installed a Garmin 140 on a tracker alum. boat. I have the transducer what appears to be at least 3/8 " below bottom of transom. I lose the bottom at least 40% of the time. Do I need to go further into the water or less? Do I need to adjust the angle of the transducer? It is parallel to the ground when on trailer.

I would suggest getting a transducer extension cable and installing the t'ducer on the left side of the boat.

This is what the manual says:
The StructureScan transducer can be mounted on the transom,
jackplate, step or directly to your boat's hull.
When mounting it directly to the hull, you must purchase a high-
quality, marine grade above- or below-waterline sealant/adhesive
compound.

Make sure the plug that gives this unit power is secure. Also I think this device has a 2ft branch that goes to the ducer. Make sure that's right too

Might help to tell us what kind of boat - deep V hull 22 ft.? bass boat with shallow V hull? Some need the transducer closer to the centerline of the vessel while others do better more outboard, Naturally they need to be flush with the hull no matter where they are located. Depending on the transducer, you could also try properly mounting it inside the vessel near the transom. Good new is you are getting good info from it. Cheers Pete

Think of where the transducer is fitted on your boat . As turbulence is the only problem you need to worry about. It needs too be on the transom but in between the lower 2 chines

I have a very similar problem. Unfortunately my boating season is over until next May. I found I was at software rev 2.30 and should be at 3.40 Some of the software updates were to resolve sounder problems.

Here are your options:

In-hull Mount Transducer (200/50 kHz, 12/45 deg)
010-10327-00

Thru-hull Mount Transducer with Depth and Temperature
010-10194-01

Bronze, Thru-hull Mount Transducer with Depth and Temperature
010-10182-01

Transom Mount with Depth, Temperature and Speed
010-10192-01

Transom Mount with Depth and Temperature (200/50 kHz, 10/40 deg)
010-10272-00

Thru-hull Mount Transducer with Depth (200 kHz, 12 deg)
010-10107-00

It all depends on the type of boat and how you are going to be using the fishfinder. Here is my email: [email protected] if you want to discuss your uses further and if you want to purchase a transducer.

Hello Keneth,
Is The transducer In Side the Hull Or Mounted On The Transom?
If Inside Remove It And Re Fit It Using Epoxy Glue Ensuring No Air Pocket Between transducer And Hull.
If transom Mounted Replace Transducer.
Hope this Helps
Gordy

Generally, that indicates air bubbles in the water under the transducer. If you have a transom-mount transducer, make sure the bottom surface is level or angled slightly down. If you have a thru-hull, make sure your bottom is fairly clean in that area.