@RGilmore You might be on to something. I wasnt sure at first, since I am in about 30 feet of water, plus, the two buoys holding up the line, the mainline would just sink to the bottom in between them. But then I thought what about a separate length of rope, tied in two places to the mainline, held up by buoys. What is difficult here is how much buoyancy to hold the extra rope up, but not float to surface. Last year did some experimenting with this and a turn ball, almost completely deflated will still float to the surface and suspend the mainline.
Then I thought, I can use poly rope, which floats, vs nylon. It would float, but not pull the mainline up. But it would be a loose loop, whereas what we want is straight up to about 5 feet below surface, then a long enough horizontal stretch to find with a grapple or boat hook, then straight down. Thinking about it some more..... I could take 30 or 40 feet of 1/2 inch pvc pipe, sealed at both ends. It would be buoyant, but not pull up the mainline. If I am in 30 feet of water, I would have a rope at each end, to tie it to the mainline. I think I am on to something here, but 2 questions remain. Would 30 or 40 feet long be findable pretty much in the middle of a small lake (vs in a narrow cove, where most courses reside) Certainly easier to find and hook than a single ball 5 feet below the surface. Second question, once the course is floating with all the buoys, what do I do with the 40 pvc pipe that would now be floating at the surface. I could unclip it, but at 30 or 40 feet, even with the pontoon boat I use to float and sink the course, it would be ungainly to handle. Maybe I could clip a weight to it to sink it when course is deployed, but now its getting complicated. Any thoughts? Am I going down a path that has potential?