In simplest of terms, speed over ground is the speed of a ship with reference to ground. Speed over ground and speed though water are most misunderstood terms. Hence vessel is underway but not making way. In situation 5, even though vessel is moving with respect to ground, she is stopped with respect to water. So in this case the vessel is making way through water. In situation 4, vessel’s speed over ground is zero but she is still moving with respect to water. But when the vessel’s speed is reduced below which the rudder is not effective and ship cannot alter her course, she would be underway. Till the time vessel can alter her course with the rudder, the vessel is making way. So in situation 3, vessel still has speed through water. We need to know if the vessel is controllable by helm or not. There is another factor that we need to take into consideration while deciding if the vessel is underway or making way. It is defined by whether or not ship has any speed through water. Now what do you think the vessel is doing in these three situations.Ī vessel is “making way through water” or not is not defined by whether or not she is using engines. The vessel has its engines stopped but would be moving with 5 knots GPS speed because of following current.
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