How often do ISSCs need to be endorsed?

The correct frequency for endorsing an International Ship Security Certificate (ISSC) is indeed between the 2nd and 3rd year of its validity, which aligns with option B. The ISSC is typically valid for a period of five years, and during this period, it must be endorsed at intervals to ensure that the ship continues to maintain its security standards and compliance with the International Maritime Organization's regulations.

This intermediate endorsement allows for both assurance and verification that the ship is adhering to the International Ship and Port Facility Security (ISPS) Code. By having this requirement, it helps in sustaining the ongoing effectiveness of the ship's security management system and in addressing any new security concerns that may have arisen since the initial issuance of the ISSC.

Endorsing the ISSC between the 2nd and 3rd year is an important step in maintaining the integrity of maritime security measures, reinforcing the importance of regular evaluations and updates as necessary.