July in Lake Huron’s North Channel is a special time. The cruising season is in full swing and what is normally a quiet wilderness area begins to come to life with cruisers looking for the perfect anchorage. Last year my family and I spent nearly a month in the North Channel visiting sleepy ports, rugged islands and one of the world’s largest freshwater fjords.
The 1,000-mile round trip from our homeport of Grand Haven, Michigan, also allowed us to experience gunkholing at its best. Our all-time favorite anchorage is now a tiny gunkhole we found on the south side of South Benjamin Island. Here a narrow channel snakes through a granite landscape into two fabulous coves. There’s only room for one or two boats in each hole, and we were fortunate enough to find one open in peak season. Once we secured our boat, we spent several days doing nothing but taking in the beauty and solitude around us. Each day we picked our fill of blueberries, scrambled over boulders worthy of a moonscape, swam in the clear blue water, and generally fell into rhythm with nature. All of this was made possible by the security, seclusion and close confines of our gunkhole.
Every cruiser has searched for perfect out-of-the-way little spots like this. Such gunkholes often involve coping with shallow water, a tight entrance and confined anchoring space. But challenging navigation and boathandling are the price paid for getting to enjoy such a fine private anchorage. While the best gunkholes are often not covered in guidebooks, with some diligent searching, close examination of charts and questioning of other cruisers, you can find great spots to explore along almost any coast. Areas like Lake Huron’s North Channel, the Chesapeake Bay, the coast of Maine, Washington State’s San Juan Islands, the Bahamas, the Florida Keys and many others are all well known for their plethora of gunkholes.
A Preliminary Survey
Once you’ve located a potential gunkhole, you can minimize navigation risks by first anchoring outside and using your dinghy to survey a narrow, shallow or otherwise tricky entrance. Modern charts, electronic or otherwise, may not accurately represent tight coves and their entrances, so it is wise to gather your own data and check for adequate water depth for both entry and anchoring.
Tech-savvy gunkholers carry handheld depthsounders in their dinghy’s gear bag for such occasions. Handheld sonar units are relatively inexpensive and are typically about the size of a flashlight. I personally carry NorCross Marine’s Hawkeye H22PX and use it often in gunkholes, as well as in unfamiliar passes, bays and backwaters.
If you’re a low-tech cruiser, you can use a leadline, which is simply a long piece of line with a weight on the end that is marked at measured intervals. To take soundings, drop the weight overboard, take up slack in the line when it touches bottom, and then note which depth marker on the line is nearest the water’s surface. The weight on a traditional lead line (called a “plummet” or “plumb bob”) will have a hollow tip that can be filled with tallow, peanut butter or some other sticky substance. This allows you to sample the bottom and get an idea of the holding ground in the area. Mud or sand normally indicates the best holding, loose shells and small stones may or may not indicate good holding, and an empty lead may indicate large rocks or grass, which may provide poor holding.
In addition to sounding the entrance, you should also sound likely anchoring spots, taking care to make notes if the gunkhole is complicated. Look for natural ranges where objects in the foreground and background line up along a favored line of approach. Note any hazards such as submerged logs, boulders and ledges. If necessary, you might even set a series of small floats on weighted lines to serve as nav buoys to help guide you in.
Having surveyed the gunkhole’s entrance and anchorage, you can then decide whether to go in with your sailboat. Don’t forget to factor in tidal effects if they are present. As a rule, it is best to enter and explore any gunkhole on a rising rather than falling tide, so you can get off easily if you run aground.
Securing Your Boat
Once inside a gunkhole with your sailboat, you may need to get creative when anchoring to deal with poor holding ground or a lack of space. It may well be necessary to use a short scope on the anchor rode. You may not have the swinging room to lay out the recommended 7:1 scope and may have to settle for something like 3:1 instead. If your gunkhole is well protected with good holding this probably won’t create problems. If necessary you can compensate for the lack of scope by setting another anchor or by taking one or more lines to shore. These lines should be rigged at one end of the boat with the anchor at the other holding the boat in deeper water so it won’t go aground. It is easiest to set the anchor first and then carry one or more lines to shore in your dinghy. If you don’t have a dinghy, look for a steep-to shoreline that will allow you to set a crewmember with lines ashore from the bow. Be especially cautious if you’re setting a stern anchor and bringing the bow to shore, as the rode for the anchor will be paid out closer to the prop and rudder than usual.