In the decade and a half that my partner, Nancy Krill, and I have cruised Tamara, we have followed pretty much the same procedure. Unlike the wire rope on Quin Delta, Tamara's anchor rode, like most well-found long-distance cruisers, is all chain. Though it doesn't "sing" under tension in the same way as wire, the chain nevertheless transmits a lot of information about the bottom that the haptic senses translate in the brain. I'd hold my hand around the chain, and as Nancy progressively added power in reverse, we'd use the same signals. We added a few more just to satisfy my own sense of ultimate responsibility. Since I was not at the helm and couldn't judge the amount of power applied, our signals grew to include my upwardly extended and twirling index finger to signal that she could apply more power, and then she would signal me with a down-turned palm waved horizontally to indicate half astern, then finally, an upturned thumb to signify full astern.