@FSH 210 Sport , thanks for posting the video.
Can’t a fisherman accomplish almost the same thing by placing a heavy weight on the fishing line?
Kind of but, if you run a lot of weight that has it’s own challenges.
With enough weight on the line to take it down that far while you are trolling it, well, it adds a lot of weight on the line and makes catching fish difficult because you have a lot of weight on the line. There is a significant loss of sensitivity with a lot of weight on the line as well.
If you run out a lot of line to get a deeper depth when you make turns they have to be very wide to keep from having the lure stall out and sink possibly getting snagged on the bottom, and if you have multiple lines out they can cross and get tangled. This is the method I use the most, sometimes I’ll have 100 yards of line out to get the lures down where I want them, as well as setting up the spread so the lines don’t tangle. But it is still a bit of trial and error as I don’t really know how deep my lure is. Also, the faster you troll the more shallow your lure is in the water, some days and or fish species like faster trolling speeds than others.
Even using those two methods you still don’t know exactly how deep your bait is.
With a down rigger, when you mark the fish-how deep they are-with your sonar you can now drop your bait right into where they are because there is a line counter built into the down rigger. Fish, especially predators, hang out where their food is so you want to present your bait right in that area accurately to have the best chances of catching the fish you are after. My goal with this system is to go after the bigger fish that hang out close to the bottom, maybe 5-10‘ off the bottom of a 200’ deep lake. I plan on using this system for trolling and drift fishing with live bait.
As I mentioned above about trolling speeds, if you are going after fish that like that higher speed, there is a chart that comes with the down riggers that shows how far down the ball is at a given speed. So, you can either let out a few more feet of line on the down rigger, or switch to a heavier ball.
I have caught plenty of trout, pike, and even blue gill trolling the way my Dad taught me, but I want to get after those bigger fish down deep.
Does that make sense?