Chris, I'm not a electronic guru...but it was explained to me by Bren at Anchor marine. (formerly worked at Victoria Marine Electric) I had a paper Furuno back in the day and saw individual salmon daily. In fact I could get onto the fish before the bite started. As an example I would know where on the ebb back eddy off Possession point they were laying and how deep. I would shorten by tack to almost a circle and bracket that depth. 9 times out of 10 I would be into a fish as soon as the bite began.
It has to do with a 6 to 10 inch screen covering lets say 200 ft of water. There are only say 2 or 3 pixels on the display per foot at that setting. A 10 pound salmons body may be 10 inches in depth and say 30 inches long. You are only going to get 2 pixels vertically and 4 horizontally to mark that fish. That would be in an ideal situation, directly under the boat and suspended. Not much of a mark and hard to distinguish from the other clutter. Just like cameras...you need a very high end digital camera to match the old high end SLR. Todays sounders aren't there yet, cameras are getting closer every day as sales volume brings the costs down.
It has to do with a 6 to 10 inch screen covering lets say 200 ft of water. There are only say 2 or 3 pixels on the display per foot at that setting. A 10 pound salmons body may be 10 inches in depth and say 30 inches long. You are only going to get 2 pixels vertically and 4 horizontally to mark that fish. That would be in an ideal situation, directly under the boat and suspended. Not much of a mark and hard to distinguish from the other clutter. Just like cameras...you need a very high end digital camera to match the old high end SLR. Todays sounders aren't there yet, cameras are getting closer every day as sales volume brings the costs down.
