Complete the sentences with the correct verb forms.

 1. The Catalogue of Admiralty Charts and Publications  (be, publish) every year with current and updated editions of charts.

2. An updated and corrected chart folio system  (comprise) of  Chart correction Log and Folio Index, Admiralty Chart catalog, Admiralty Sailing Directions, Weekly Notices to Mariners, Annual Summary of Notices to Mariners,   Admiralty List of Lights, Admiralty List of Radio Signals, Admiralty Tide tables, Chart – 5011 Symbols and abbreviations to be used on charts. 

3. All the charts and publications are  (be, correct) on weekly basis.

4. Other than that weekly Notice to mariners, Annual Summary of Notices to Mariners, their supplements should  (be, provide).

5. The importance of keeping nautical publications updated can  (be, understand) from the below incident.