Now you know how to find your time to an anchorage, distance traveled, or sailing speed fast and easy with the magic triangle. Going 5 knots? It'll take just 12 minutes to sail one mile (60 / 5). Sailing at 4 knots? You'll cover one mile in 15 minutes (60 / 4). Want to know how long it will take to travel one nautical mile? Divide the number 60 by your sailing speed. Here's a cool tip from Bill Brogdon, author of ' Navigation for the Rest of Us'. You need to average at least 5.1 knots to make it to your anchorage by sunset this evening. Now you are ready to complete the calculation.Ģ7 nautical miles / 5.3 hours = 5.1 knots. To convert 15m to hours, we divide by 6 and round off. In this problem we start at the destination time and compare it to current time:ġ915 - 1400 = 5h 15m to go to sunset. You must always convert odd times into hours and tenths of an hour. What speed do you need to make to get to the anchorage before sunset?Ĭover up: Speed. You are sailing to an anchorage 27 miles away and want to make it there before sunset, which will occur at 1915 this evening. Multiply if you see just two horizontal (bottom) factors. Divide if you see two vertical factors after you cover the single factor. Cover the unknown factor with a finger.ĥ. Place an S (for speed) on the bottom left and T (for time) on the bottom right.Ĥ. Place a D (for distance) on the top section. Divide into three sections as shown in the illustration.ģ. In order to answer any one of these questions, you must know the answer to the other two questions. These are the basic "big three" in navigation. Sailors always want to know one of three questions: What time will you arrive somewhere, how much further do you have to sail (on one particular course or to a specific destination like an anchorage or port), or how fast are you sailing. Follow the steps below to master this essential seamanship skill. All of navigation begins with an understanding of how to solve for time, distance, or speed. Practice basic navigation skills to understand sailing navigation.
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