I had training with an additional anchor. I have attached 30 feet of chain to Danforth anchor and then the rope. The other end of the rope i did tied to Tereza. I put it all together in dingye. Then i drove approximately 15 feet away on the left from the point where main anchor was . And i throw the anchor. Then i went back to Tereza and and pulled the rope to get anchor to hold. After that i release the rope again. I was then checking trough the afternoon if the rope get in tension. I that case i would now that the tandem is plowing.