I purchased a fluke. Has the ability to dig down in the sand. I had a 16 foot Crestliner with a 30 pound river anchor on it before this boat, it's claws dug in and held pretty good but was a smaller boat. Your correct about the amount of line to let out, not sure I have 125 feet. But with out the correct anchor your waisting your time. Can't wait to get back out there.