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Maybe a stupid question, but would a SI transducer work if turned sideways on the TM or on a pole on the front of the boat, could you see 120' in front of the boat and see what is coming instead of what you just passed? Seems it would be handy trolling.
SI is not a camera lens that captures everything in front of the SI piezo and then displays everything as a video camera would ...
SI captures data (with each individual Sonar Ping) within the thin slice SI beam (less than 2° thick front to back)... much like MRI captures thin slice pictures of the human body ...
The processor "stacks" the thin slice data back together on the display to create the entire picture ... much like the MRI would "stack" it's think slice pictures back together to create a picture of the whole human body ...
(The scrolling effect of the SI display is, in fact, the processor "stacking" the thin slice data back together... inserting each new slice of data into the top of the SI display) ... .
SI must scan to create the image you see on the display ...
It is possible to scan the SI xducer in any direction... capturing thin slice beam data during the scan (with each individual Sonar ping) ...
One just needs to be able to decipher what those the slice beam data captures are representing on the SI display ...
Rickie
I was at Reelfoot Lake in TN when I saw a boat set up with a transducer on the shaft of the TM facing, not down, but forward (while the TM was deployed). I waited until the owner came out of the restaurant and asked him about it. He explained that he could approach stumps (Reelfoot has lots of stumps) and see the fish around them. He also said the "depth" was very inaccurate as the beam of the conventional DF was too wide to pick up just the stump. I have an older DF/FF - a standard SONAR, not DI or SI I plan to use the same way.