Pyrotechnic VDSs must be at least three unexpired signals on board to satisfy the requirement. They also need to be Coast Guard-approved, in serviceable condition, and readily accessible.

If you want the exact test-style wording, the safest answer is:

  • At least three pyrotechnic VDSs must be carried.
  • They must be unexpired.
  • They must be approved and usable.