by Chinook » Fri Feb 05, 2010 3:02 pm
On our cruise to the Abacos, in the northern Bahamas, we carried two anchors. Neither were very heavy, but were rated for boats 26 to 30 feet in length. Our primary anchor was a plow style anchor called a hydrobubble. This anchor is supposed to have very good setting characteristics in sand bottoms like those encountered in the Bahamas, and we found that to be the case. It was rigged to 20 feet of 3/8" chain and 200 feet of nylon rode. Our other anchor was a Fortress Guardian (FX-11), which weighs 7 lbs, and is supposed to equate to 13 lb danforth style anchors. We found that it set better than the hydrobubble in very fine silts like those encountered on the southern portions of the ICW, down around Georgia. This anchor is rigged to 15 feet of 3/8 inch chain and 150 feet of nylon. These anchors served well in the Bahamas, and I frequently set both, Bahamian style, with rodes tied off to the bow. I usually dove down and visually inspected the set. We anchored out in windy conditions on several occasions, but in locations offering good shelter. During some of the windiest periods, we were tied up in marinas.
We did drag anchor once, under odd circumstances. We were headed for Walker Cay, where we planned on staying at the marina. We couldn't raise the marina by VHF when we were 5 miles out, but they radioed us when we were entering the breakwater. They said the marina was closed and we couldn't stay. This was disturbing because we needed fuel, and also a squall was bearing down on us. They did sell us gas, but then told us they were closed to moorage and we had to leave. I should have insisted on staying, with the squall closing in, but didn't try to force the issue. I didn't have a good course worked out to Grand Cay, the nearest sheltered anchorage. We had the option of going way out, broad side to wind and seas, or staying in close to Walker Cay, over some shallow banks which the cruising guides didn't recommend, due to shifting sand bars. We opted for the shallow route (love that shallow draft Mac), and made it ok to Grand Cay. Needless to say, I was very tired by the time we entered the sheltered channel where boats were anchored. I tried several times to anchor, but the bottom was hard and I couldn't get the anchor to set. A local fisherman, seeing I was having trouble, called to me and suggested a spot over near his boat. I moved there and set the anchor, and we turned in. During the night the wind shifted and blew hard down the channel. We ended up dragging, despite having 2 anchors out. I think the currents running through the channel at Grand Cay resulted in very little bottom material for setting anchor. It got a little chaotic, in the middle of the night, getting the 2 anchors up, untangled, and motoring over to a different spot where we held well for the rest of the night.
Having said all this, I do feel that anchor weight and chain length/weight is important, but so is anchor design, choice of anchorage, and proper setting technique. Heavier ground tackle equate to larger stowage requirements and harder work when manually raising them. I tend to rely on manufacturers recommendations regarding suitable boat size, and select at the top of the range or if close, the next size up. I also like having a variety of anchor styles, to fit different bottom conditions. I like the fortress for very fine silt, the hydrobubble for sand bottom, and the claw (Bruce) for harder to cobbly bottoms. I also pay careful attention to the potential of reversing wind/and or current, and plan my anchoring strategy accordingly. Incidentally, we gave the Bruce a good test in the Sea of Cortez, where a very strong wind (30 knot range) blew all night while we were anchored in a broad bay. We started out in the corner of the bay with most shelter, but the wind shifted during the night, allowing refracted swells to beat us up pretty good. I got up for anchor checks every hour or so, but the Bruce never budged. At first light we moved to the opposite corner of the bay, which offered better protection.