holazola Nov 19, 2019 05:47 PM What Are These? Here is a little summary info I had - I'll see if I can find the source somewhere: At this location are a pair of markers, that when viewed from offshore, indicate a Nautical Mile from the harbor breakwater next to the Yacht Club. There are another pair one mile further east just below the cemetery . These markers have been used for over 100 years for measuring a ship's speed over the "measured mile course". Several new Navy vessels in the Early 1900's completed their acceptance testing here, proving they could maintain at least 20 knots over the course.