We recently purchase an Oday 30. The boat included a large blue canvas maybe 10 X 12 with a section in the middle and both ends for insertion of expandable poles and there is a split on one of the ends without the pole obviously to fit around something. In the middle above the pole insert is a metal ring. Does anyone have a clue how this is rigged, if you can point us to a picture or drawing that would be even better.