law: Marine Insurance Act, 1963 
  51. Excuse for deviation or delay 
  (1) Deviation or delay
  
  in prosecuting the voyage contemplated by the policy is excused-
  (a) where authorized
  
  by any special term in the policy; or
  (b) where caused by circumstances beyond the
  
  control of the master and his employer ; or
  (c) where reasonably necessary in order to
  
  comply with an express or implied warranty; or
  (d) where reasonably necessary for the safety
  
  of the ship or subject-matter insured; or
  (e) for the purpose of saving human life or
  
  aiding a ship in distress where human life may  be in danger; or
  (f) where reasonably necessary for the purpose
  
  of obtaining medical or surgical aid for any person on board the ship; or
  (g) where caused by the barratrous conduct of
  
  the master or crew, if barratry be one of the perils insured against.
  (2) When the cause
  
  excusing the deviation or delay ceases to operate, the ship must resume her
  
  course, and prosecute her voyage, with reasonable dispatch.