Transducer location for 22 Angler

[Vanimal]

Have a 22 Classic for the past twenty years or so. Fished it offshore for Albacore tuna and recent years for Bluefin and BigEye out Fort Bragg. Purchased a 22 Angler in September with less hours than my classic and am setting it up for chasing tuna. My depth finder does not read well when I am at 6 knots.
I hear I need a 1 kw transducer thru hull but do not like the idea of drilling a 3.5 inch hole in the bottom of my boat.
I am hoping a 1kw transom mount transducer will work. Curious how far away from the drain plug I need to be on the starboard side, and if the transom mount is capable of seeing bait etc at trolling speeds.
Been able to limit out on Albacore a few times over the years and done well on the big tunas but I have been fishing with sonar that only shows bait after I hook up and slow down. Works fine at speeds for salmon, bottom fishing etc.
Cheers,
Van

[Flashyfish]

I have two SIMRAD GO9 units on my Angler. One transducer is Active Imaging 3 in 1 and is transom mounted.
The other shoots through the hull forward.
I can maintain bottom contact and scanning with the rear transducer up to about 10 knots. When trolling for salmon at 1 1/2 to 2 knots, I have a solid return and bait balls are readily visible.
The forward transducer is a standard 83/200 and offers less detail than the transom Active Imaging one. I have the forward transducer shut off in normal fishing to avoid interference.

The rear side scan transducer is mounted on the starboard side 26" over from the transom drain plug.

The flatter the ocean, the better they work at speed.

[thataway]

I have run two transducers on a number of boats, side by side--as long as you keep them at differenct frequencies.

I tend to put the screws into a block of "Starboard"--HDPE, which is located a few inches outboard of the drain plug. You want it out of the direct prop wash. All of my have held bottom from dead slow up to 20+ knots.

It is important to have the transducer just very slightly below the bottom--no more t han 1/8 of an inch--and this includes the down scans, side scans, CHIRP and "Real Vision". All of which I am using on my current boat (18' Catamaran) and The C Dory 25 I last owned.

[Vanimal]

Thanks for the advice and information.
cheers
van

[shad]

I am a recent C-Dory 22 Cruiser owner who has not fished offshore yet, but a pic of my transducer location is below. It seems to register the depth fine but sometimes loses bottom around 20-30mph in chop. It definitely works fine at 6-7 knots around Puget Sound and Lake Washington. That said, offshore might be a different scenario. The transducer is a Garmin GT56UHD-TM.



--Shad