COLREGs shorts - Speed over Ground (SOG) and Speed through Water (STW)
Автор: AI EDU HUB
Загружено: 2023-05-06
Просмотров: 399
Описание:
Navigators need to use speed through water as well as speed over ground judiciously. Speed over water is only required to be used for collision avoidance, means to know the ASPECT of the vessel and which COLREGs rule applies, if cannot see other vessel visually (for example in fog or restricted visibility) for same reason, in areas with strong current, to check operational condition of equipment (both CTW and COG should be precise/realistic).
By using speed over ground, a navigator is more aware of the situation than otherwise. For example, if the ship is drifting towards a danger, navigator will know it better if he has speed over ground in radar. This is because, with speed over ground radar will show a vector of course made good. (Vector need to be selected as true in this case).
Using speed over water, a navigator can be sure of his assessment of COLREGs situation. Using speed over ground can give an early signs if the ship is drifting towards a danger.
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