As an FYI, I always carry a 6ft SMB with a reflective strip. At no time did I think that the boat could not see us. We discussed inflating the SMB but we could either see the lights of the boat or the glow. We reckoned (correctly) that they were sufficiently elevated to see our lights. Just for the record, I had the DRIS 1000 lumen primary and stubby backup. Those things are like having your own personal lighthouse at the surface. When I got back to the boat, they confirmed that they had never lost sight of us. (I just bought a EPIRB).