Great afternoon for sailing

8 knots from the south was enough to draw 8 sailboats out to Round Bay on the Severn on a fall afternoon with 70 degrees.  Took Lark out with a performance-minded buddy and was able to get the main to go up a little higher, and find that the windex was mounted slightly off-center.  And that the apparent wind angle shown on the instruments isn't equivalent on both tacks.  Seems I need to re-configure some things.  Great day to be out, though, regularly getting 3.7-4 knots in 7-8 knots apparent.  Lovely day!