Just so you won't be too discouraged, I am sure that you know that seeing a steady 5.3 to 5.7 knots on the GPS in 13 knots of wind would qualify as painfully slow for a cruising 45 footer. You should be able to get a little better speed once you learn to sail your boat.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay