If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?

  1. Its operation must be approved by the master of the ship or the pilot in command of the aircraft
  2. The amateur station operator must agree not to transmit when the main radio of the ship or aircraft is in use
  3. The amateur station must have a power supply that is completely independent of the main ship or aircraft power supply
  4. The amateur operator must have an FCC Marine or Aircraft endorsement on his or her amateur license