Probably for a wisker pole
A wisker pole track usually starts lower down on the mast than a spiniker pole track and usually does not need to go up very far. A wisker pole extends more or less perpindicularly out from the mast to the jib clew and hence starts at a position on the mast more or less the same height of the jib clew. Fron there only minor adjustment up or down would be required. Small boats will only use a fixed ring attached to the bottom of the mast. However, it is possible that there is an entirely different purpose for this track, but I am at a loss to determine what. It may actually have something to do with a spiniker pole set up.
