With High Wind

Wind effect

Strong winds usually do not affect a Nettle Net Boat Pool, but they do affect your boat. Your boat, in turn, affects the pool. We all have the experience of our boat "sailing" back and forth at anchor in a squall. The stronger the wind, the more your boat swings at anchor until several dozen feet or more are traversed and the movement about the anchor can get quite violent. Any pool tied to your stern will be dragged back and forth and can lose its circular shape, sometimes making it difficult to swim. On rare occasions, the boat can also pull the float ring out of the water, allowing the wind to get under the ring, lifting the ring further and turning the ring into the shape of a pretzel.
Not so apparent is that wind of any strength will cause your boat to sail to and fro at anchor regardless of the size or type-sail or motor. The larger the boat, the slower it swings but also the further it swings--always dragging the pool back and forth. The circular shape is eventually lost as the wind increases.  
If your Nettle Net will not take or maintain a circular shape, either your boat is at least slowly dragging the pool or the tidal current is too fast. A good indicator of the problem is that the pool will first appear to be on one side of the boat then, in several minutes, will be on the opposite side or the pool will wrap around the stern of the boat. The problem, 95% of the time, is caused by your boat sailing at anchor.   
There are several possible solutions such as using two anchors, stern anchoring, or using a shorter rode that could stop sailing (never use a shorter anchor rode than is required for your boat’s weight, the water depth and wind and weather conditions). Tying additional mooring lines from the side tie straps on the pool to cleats or stanchions on the boat can improve the pool’s ability to keep its shape if the sailing is not too severe.
But the most successful and simplest remedy is to try the "bridle mooring" technique. Anchor normally, and then prior to deploying the pool, establish a bridle with the anchor line that will bring the boat more broadsides to the wind. This will greatly reduce the boat from "sailing" at anchor and will allow swimming in much higher winds. Use a bridle line that is about the length of the boat. The bridle should be formed by securing this bridle line from a rear cleat or winch direct to the anchor rode. Use a rolling hitch knot to secure the line to the anchor rode. Let out an additional length of anchor rode (the same amount as the length of the bridle line) and the boat will now lie more abeam of the wind and be very stable. Lastly, deploy the pool from the side or stern.
Prior to retrieving the Nettle Net, release the bridle line from the stern and drop its bitter end in the water so the boat swings again from the anchor rode. Retrieve the pool then retrieve the anchor line whenever convenient. The bridle line will come aboard with the anchor line. In an emergency, you can quickly get out of the bridle by simply releasing the bridle line from the stern.