The Regulations of Aids to Navigation Service Fee Article 8

For those vessels making regular payment of the aids to navigation service fee and which have berthed only once at a port of call of Taiwan during the valid period of the proof of payment may extend the valid period of the present proof of payment by four months. However, such extensions may only be applied once.Vessels berthing at a port of call of Taiwan as mentioned in the preceding paragraph more than twice during a single continuous voyage shall be counted as having berthed once.