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Last season I asked about line marker for your tip up lines and had a great many helpful tips. I tried out one and had great luck with and thought that I would share it;I got them at Radio shack for a few bucks and even cheaper on ebay;(Image removed from quote.)(Image removed from quote.)I liked them better than any of the many other things that I have tried, buttons, knots/loops, small bobbers and rubber bands.Easy to move on the line, with a little glow tape they worked great at night, Cheap, they held up, just enough floatation that if dropped in the hole they can be retrieved and no knots left in the line! As to using bobbler stoppers, I use them a lot in open water, but moving them back and forth on the wet freezing Dacron, would not work for me well I move my tip up to much... To each his own, but here is one more "Tool"...
I simply use a button from a shirt (dark color) use 2 holes and the button slides to any depth you want to mark.
Sonar can indicate so much more, but, I guess it doesn't belong in this topic.
I tie a slip knot and put a match through it.