One is sufficient
One well set anchor with the right design for the ground, and adequate scope will hold up to gale force winds in an anchorage protected from the waves, even if the wind shifts.In Lake Erie with mud or sand bottoms, one danforth, Bruce, or claw does the trick. A second anchor is only needed to restrict boat movement in a crowded anchorage, or if winds rise above gale force.A second anchor may give peace of mind, but the extra effort to set it every time would reduce the frequency of anchoring out for us. As it is, we anchor out about on third of our nights on the boat. We love it, especially in Sandusky Bay and the Islands where there are always good anchorages whatever the wind.DavidLady Lillie