In the header image, the interesting gray-bar informational panel placed on the wreck caught my eye. I wonder what it's for?
I assume it's to calibrate scale and color for the underwater photography equipment, but would be interested to learn more from someone who knows for certain.
It's a photogrammetry scale card made for the National Park Service, probably the Submerged Resources Center which often assists with this kind of stuff.
The NPS has a few different ones for paleontology, underwater archaeology, etc.
In the header image, the interesting gray-bar informational panel placed on the wreck caught my eye. I wonder what it's for?
I assume it's to calibrate scale and color for the underwater photography equipment, but would be interested to learn more from someone who knows for certain.