A Loon is in the photograph, which had just surfaced in front of me.
It shows the strand from a torn plastic tarp, which is attached to the forward end of the boom.
A metal paper clip is attached (to the upper left of the Loon), which holds the strand from tangling against the sail or getting stuck on a wet deck. The [breast] feather is located to the lower left of the Loon. Most often on this lake, the wind is "light and variable": at other times (15-knots+) I don't risk going out.
On June 9th, a warm, partly-sunny, but otherwise "gray day", I got caught in a sudden storm which tore my racing sail then broke my mast.