Simplify the following text for a Grade 10 native English-speaking person.
Original: The 2,500-strong Pakistan Coast Guard , headquartered in Karachi , is responsible for maritime law , and maintenance of seamarks , border control , anti-smuggling operations , and other services .
Simplified: Pakistan Coast Guard ( PCG ) , is responsible for the law at sea , maintenance of seamarks , border control , and other services .