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I frequently use 2 anchors off the bow. When the two rodes (actually 1 chain and 1 line) "wrap" I use the dinghy like a tug boat and "spin the boat" to get the wraps out.
To do this, push the aft part of the side of your boat with your dinghy. The bow of the dinghy should be against your boat at an angle so you are pushing your boat backwards, tensioning on rode/line and making the other one slack. This keeps the anchor line that will pass under your boat (during the spin) slack, so it doesn't get caught on your keel.
You can also use a line off a stern cleat and pull the boat around, using a line to the dinghy's bow eye, although the dinghy's prop doesn't seem to have the same effect in reverse. And your dinghy's prop wash is hitting your boat's rudder, also slowing the process. This method give you lots of visibility since you can see where you are pulling your boat. (It's more difficult to see when you are pushing the boat. I use other sailboat masts as a reference, since I can't see over the boat's 5' of freeboard when sitting in the dinghy.) When pulling like this, position your dinghy 45 degrees aft of your cleat, so you are pulling your sailboat back to keep the tension off the line passing under your keel.
Either way you choose, do it on a calm, no-wind morning.
Once you get past 180 degrees, any wind will help your boat complete the 360 spin. However, continue pushing/pulling with the dinghy, to keep the tension off the anchor line going under the boat. The wind will not do this for you.
Hope this helps.
P.S. I tightly wrap a towel around the line and securely tie it in place at both ends. This has kept the chafe (from the chain) to a minimum. When doing the double anchor technique for any length of time, I move the towel-spot on the line periodically.
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