Most of those sausages are designed to be filled with air from the scuba tanks, I believe...and I'm not sure how much they would add to your visibility from the air
Mine you can inflate manually and can be seen from a reasonable distance in moderate weather when you wave it like a madman...
don't ask me how I know. twice
a) dive boat left me 3 miles offshore
b) used to alert large vessel that felt like it was going to drive over me (while still at 20' deco stop depth. tied it to my cave line and sent it to the surface). Not sure where that boat actually was, but the engine vibration was strong enough to make my chest hurt)
