You’re getting close to an island landfall couple of miles ahead. You might have heard from other sailors to keep free from the razor-pointed coral formations on either side of the entrance. Yet did you know what these chart symbols could may appear like on a navigational chart? Here below are some guides to enhance you cruising navigation skills with these 5 notorious danger symbols you must know for safe sailing
1. Recognize Your Shoal Colors
Study your chart for blue or green colors once you approach land. Chart designers come up with blues darker when the water gets shallower. Employ this simple mind key “The deeper the blue, the greater danger to you”. However, you will discover many charts that display only one shade of blue.
Focus on the border of each shoal that displays depths less that 2 1/2 times your draft. As an example, if your tiny cruising sailboat has six feet of draft, you must spotlight any shoal water less than 15 feet. Raise this aspect as you see fit (to 3 x or 4x draft).
Search for green tinting across the shoreline. This tells locations that cover and uncover with the tide. In many instances, these types of shoals are going to be undetectable from greater stages of the tide. Keep properly away from green tinted areas to avoid going aground.
2. Learn Bottom Abbreviations
Understand the most typical 2 to 3 letter abbreviations that show you the kind of sea bottom. These are:
S = sand M = mud Rk or Rky = rocky or rocks Cl = Clay Co = Coral
Realize that each abbreviation displays slanted letters. Chart manufacturers use slanted text on objects that adjust with the wind, tide, or current. To read more chart abbreviations and symbols, follow this link for a FREE download from the Office of Coast Survey. ==> http://www.nauticalcharts.noaa.gov/mcd/chartno1.htm
3. Beware of Plus Signs
Rocks that are underwater at every stage of the tide appear like a “plus” sign. You can see these types clustered together or like a solitary symbol. Ensure that you highlight them in order to stick out on your nautical chart in every light and weather conditions.
4. Stay Clear of Plus Signs with Dots
Chart makers include dots into the 4 open edges of a plus sign if ever the rock becomes a wash – or breaks the water surface–at reduced water stage shown by your chart. In enormous weather, breakers will probably form over rocks. Stay clear to remain safe!
5. Look for Asterisks that Uncover
There are at low water you can see several rocks or small islands–called islets. Rocks are shown as asterisks, and islets as tiny, squiggly, unequal circles. Search for an underlined height close to the symbol. This demonstrates what amount of the rock or islet is going to be noticeable at the low water. Several islets indicate as smooth (not squiggly), unequal circles. These islets are noticeable at every stage of the tide.
These types of 5 sailing chart navigation techniques will get you going on your path to understand the most critical chart symbols and abbreviations for safe sailboat traveling. This way, you will gain the confidence you need to make your sailing crew protected and sound–wherever on the globe you decide to cruise.
