Listed below you will find links to various organizations and sites which will provide you with helpful information to use while sailing and traveling.
Let's begin with the two most reference sites for American mariners.
Next, let's cover charts and weather.
Moving on, are two links with cover international maritime information.
Below are links that will take you to the Marine VHF Channel for both the United States and the International channels and frequencies. The information is provided care of the United States Coast Guard Navigation Center.