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On the colder end, 20 degrees was plenty adequate

I dont know if it was Rosenbauer doing it or what

Abu Garcia Waterproof Duffle Bag Backpack with Detachable Seat The Abu Garcia Base Duffle Bag is waterproof, has adjustable shoulder straps, a carry handle, ample space for all your fishing tackle, and a detachable folding chair with a mesh PVC seat

NTA has a technical cutoff for detecting particles with a higher diameter, above 1000 nm (due to the limited Brownian motion, possible particle overlap, and dynamic range of the camera), but can detect particles as small as 10 nm 54

For me, I have a simple rule of thumb which works while on the boat