law: Indian Ports Act, 1908
  47. Port-due on vessels not discharging or taking in cargo
  
   
  When a vessel enters a port 14[not being a major
  
  port] subject to this Act but does not discharge or take in any cargo or
  
  passengers therein (with the exception of such unshipment and reshipment as may
  
  be necessary for purposes of repair) she shall be charged with a port-due at a
  
  rate to be determined by the 58[Government] and not exceeding half
  
  the rate with which she would otherwise be chargeable.