a) In the event of visibility becoming obscured to less than 4miles.
b) In the event of failure of any of the ships navigational equipement.
c) On any occasion that difficulty is experienced in maintaining the course.
d) If traffic was causing concern and effecting the safe progress of the ship.
e) In the event of sighting a landfall unexpectedly.
f) In the event of failing to sight landfall when expecting a landfall to.
g) If soundings are seen to be shelving unexpectedly.
h) On any occasion of encountering heavy weather.
i) If sighting ice or receiving ice warning reports of ice on the vessels track.
j) In the event of management of watchkeepers becomes untenable.
K) When sighting oil pollution on the surface.
l) If a scheduled position fix is found to be suspect or unreliable.
m) In any other emergency where the involvement of the master is considered desirable or essential.
E.g. Fire onboard
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