Ron: I'd run my tip ups from pretty close to shore straight out toward deep water. IMHO I think lakers cruise the entire water column in winter. Set the tip ups at varying depths and be sure to put a dead bait on the bottom on one of them. In a bathtub type lake without much structure, I suspect the lakers will cruise around a lot--just a guess. If there are areas of the lake that drop off steeper, I'd focus my attention there.