What must be visible to law enforcement personnel while operating a pwc?

The answer is registration numbers.

Explanation:

Registration numbers must be visible to law enforcement personnel while operating a pwc. Personal watercraft are required to show the registration number and validation Number must be painted, connected as a decal, or generally appended to the two sides of the bow.  

A personal watercraft (PWC), likewise called water bike is a recreational watercraft that the rider sits or remains on. PWC's are utilized for Jet Ski fishing or PWC fishing and is the quickest developing sections in the business. They are quick, sheltered and prudent and are being picked over traditional boats . Aside from the conspicuous hazards of crashes and mechanical breakdowns basic to all vehicles, working or riding a PWC can include a danger of opening wounds  .

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.