I've used quickdraw and like it. However there are only 2 times a year that water levels are stable on the lake I fish. Even when it's what I call stable, from day to day the level can change by a couple of feet. The water levels, stated as height above sea level are published hourly. For the next couple of months the water levels will rise by 6" to a foot per day. Is there not a way for me to still use Quickdraw and get accurate results. For example, this morning the level is 1669.49. Tomorrow the level will be 1670.50. In January the level is about 1652. In June 1705. Could I not pick one of these as a reference point and then each time I do Quickdraw enter some sort of offset that would be used to keep everything in sync? If so, which one should be used and how do I do the offset?