Yes you are partially correct. due to 9/11 and the Cole bombing they have emplaced new security measures. The notice to mariners is basically this: Within 500yds, idle speed only. No ship allowed any closer than 100 yds. They make a decision between shooting you when you begin to come inside the 500yd "area". If you break the 100yd "area" without a Coast Guard or Police boat stopping you, they will probably fire a warning shot over your Bow followed quickly by one to your boat should you not heed that warning. Go to the Coast Guard website or call your local office and they can probably explain it better.