[TXnMA]

The center of the most obvious one (concrete, 360' long X 44' wide at the ends) is ~850' due north of the peninsula shoreline midway between the Admiral's Quarters and the Officers' Club. its coordinates are

19.927340° -75.141248°  (Taken from the 1/5/2017 Google Earth overflight...}

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There is a triple one (oval ends, square center) at

19.929307° -75.141248°

At a distance of ~1,000 ft, bearing 44 degrees from the center of the solid structure...

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And, at a distance of ~940 ft, bearing ~42.5 degrees from the above central square -- is the estimated midpoint between two similar ovals at

19.931210° -75.139378°

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To me, they're fairly obvious... '-)

And, they're pretty massive structures. If they're all "Bollards" that simplifies descriptions -- because there are an additional dozen pairs of "ovals" located throughout the upper ends of the bay...

ThanQ for responding!!

TXnMA
 

[LonePalm]

Ah, I see now. Those are the remnants of mooring platforms for large ships, think WW2 carriers and battleships.

When I was there in '81 my ship was moored on the northeast side of the pier next to Radio Point Road. I'm sure I wouldn't recognize the place now.

Laissez le bon Trump rouler!

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)

[LonePalm]

This is what I was thinking of.

Pier-side and shipboard bitts

Bollard

You can have bitts on a pier but you can't have a bollard on a ship. Note the canvas around the hawsers in the above photo. That is chafing gear to prevent wear weakening the lines.

Laissez le bon Trump rouler!

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)