|Topic Review (Newest First)|
|05-29-2010 10:10 AM|
Contact the Sacramento Flotilla at Bob@themccaws.com
CGA Classes are very inexpensive.
|05-28-2010 05:51 PM|
You you would like some free online information you might look at:
Advanced navigation courses - sailing schools Greece and the Greek islands
Just remember that the aids to navigation section is based on IALA system A (red right leaving). You live in system B (red right returning)
|05-28-2010 05:33 PM|
|Hays||Thanks a lot guys! Definitely a lot of help, and I do plan on taking classes...just a matter of time and money!|
|05-27-2010 09:42 PM|
If you are going to do coastal work, read a book, read your charts, and have a good GPS. If they all agree, go sailing. If you are crossing a very large bay or ocean do more.
|05-27-2010 11:21 AM|
|Yamsailor||or take an American Sailing Association or USSAILING Coastal Navigation class.|
|05-27-2010 10:54 AM|
Originally Posted by Vasco View Post
A nautical mile is defined as 1852 meters.
|05-27-2010 09:06 AM|
Hays--In your effort to learn to sail it would be wise to take some of the Cost Guard Auxillary classes and particularly, in this case, the class on coastal piloting and navigation. You might also amble over to the West Marine store (there's no shortage of those in the Bay Area) and pick up one of the books on the subject.
At the scale of the Chart's you're using for sailing in the Bay, using the distance scales on the bottom corner of the chart (which I guess are chart-kits) is perfectly adaquate for measuring purposes. The "10ths" scale on the left side of the scales is to allow you to step off distances with a divider. First set to a whole measure of miles (nautical or statute) which is walked off along a course line and then, the last distance measured on the 10th's scale. Knot meters/logs and GPS devices are normally graduated in knots or nautical miles hence the nautical mile scale is normally the most useful for your speed/distance/time computations. For the sake of convenience, remember that a 10th of a mile is about 200 yards.
|05-27-2010 09:00 AM|
Vasco— The scale on a chart should be reasonably accurate over its entire area...
As Mawn has pointed out—the green dot is the same distance from the yellow or blue dots and can be used to determine distances. The reason for the side to the left of the green dot is so you can read/measure tenths of a mile.
|05-27-2010 08:41 AM|
The scale of this chart is for a somewhat small area. Therefore the longer NM.
On your example, blue to red, and red to green are each 1/2 NM, and each of them is divided into 1/10 NM. Green to yellow is 1 NM.
So, dependent on what you are using to measure NM, and a protractor works as well as anything, you have a scale that that can be translated. If something is 5.7 NM, you will move the protractor adjusted at 1NM five times and then adjust it to the balance of your distance and measure against the 1/10 scale. Clear as Mud?
|05-27-2010 06:46 AM|
Don't use the scale to measure nautical miles. Use the latitude marks at the side of the chart. A nautical mile (one minute of arc) varies in length (feet) depending on the latitude so you should always use the latitude marks.
A nautical mile varies in length from 6040 feet at the equator to 6108 feet at the pole. The mean length is 6080 feet and this is the standard nautical mile.
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