Sailors Choice           Seamanship and Navigation

Code Flags
& Pennants
Charts &
Symbols
Communication
Lights
Lines & Rope
Knots
Marlinspike
Safety
Man Overboard
Marks & Buoys Measurements
Nautical Mile
Metrics
Navigation
Rules of the Road
Time & Longitude
The Prime
Meridian
GPS
What is It
Charts & Symbols
Flex GPS This software is developed to simplify the usage of maps in combination with a GPS Receiver.
Lines and Rope
Why Knot? The 42nd Brighton (Saltdean) Scout Group from South Essex in the UK will literally "show" you the why's and how's of knots!
Or give Roper's Knots a try, an awarding winning site, a member of the International Guild of Knot Tyers and yes, there is Knot News!
Knot's Knotes, learn to tie knots in spaghetti
Notable Knot Index, with tips for untying jammed knots
Measurements
A fathom is 6 feet, the length of rope a man can extend from open arm to open arm. The rope was lowered into the sea to measure depth.
A cable length is the length of a ship's cable, about 600 feet.
A nautical mile is 10 cable lengths, or 6,076 feet.
1 nautical mile = 1.1515 miles
A knot is the measure of speed on water. One knot is 1 nautical mile per hour.
A nautical mile is 6,076 feet.
Sailors Choice Metric Conversion Charts will help you figure out those pesky measurements! (If I can understand them, so can you!)
Time & Longitude
The Greenwich Prime Meridian The line in Greenwich represents the Prime Meridian of the World - Longitude 0. Every place on Earth is measured in terms of its distance east or west from this line. The line itself divides the eastern and western hemispheres of the Earth - just as the Equator divides the northern and southern hemispheres. 
GPS
GPS or Global Positioning System is a position determining system based on transmission and location pinpointing made by tracking several satellite transmissions at one point on the earth. The Global Positioning Overview explains....
Navigation
Have you ever taken a navigation class or are you planning to take one?  If so, you need the Coastal Navigation Tool.  No more frustrating formulas to remember like "East is Least" or "True Virtue Makes Dull Company" or when to Add - when to Subtract.  Now with the turn of only two dials, you can make Corrections of Variation and/or Deviation and find the Correct Course to Steer  instantly. 

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