Which is a weekly publication advising mariners of important matters affecting navigational safety（）.

What is the significance of the broken magenta lines wh...

单项选择题What is the significance of the broken magenta lines which roughly parallel the shore between Roanoke Point and Orient Point on Long Island（）.

What is the most important source of information to be ...

单项选择题What is the most important source of information to be used in correcting charts and keeping them up to date（）.

Weekly Notices are dated for the（）appropriate to the we...

单项选择题Weekly Notices are dated for the（）appropriate to the week they are issued on the UKHO website.