Moored vessel meaning6/1/2023 ![]() ![]() 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. Situation 5: A vessel is heading downriver with 5 knots following current.So in this situation even though vessel’s engine is running but the GPS speed would be showing zero. Situation 4: A vessel is moving up river with 5 knots speed and with 5 knots against current.Situation 3: A vessel is moving while approaching a port and it stopped its engine but it is still moving with a speed of 8 knots.In situation 1, the vessel is underway while in situation 2 vessel is making way. Situation 2: A vessel is moving in open sea.Situation 1: A vessel was at anchor and it just picked up its anchor.So let us see if we understand the difference with these two situations. It is assumed that it is easy to understand when a ship would be making way through water. Now COLREG does not give any definition for a ship making way. In simple words when a vessel is afloat and in no way is touching the ground or seabed, she would be underway. The word “underway” means a vessel is not at anchor, or made fast to the shore, or aground. So what is the difference between a vessel that is underway and when it is making way. But what makes it important to differentiate between these two terms is the inclusion of these in COLREGS.įor example, a vessel not under command is supposed to display different lights when underway and when making way.Īlso a vessel need to sound different sound signals when underway and when making way. These are simple terms but if we go in details of it, it might not look so simple. Let is break these eggs to know the answers. There are many such confusing terms and I am here to discuss some of these. If navigators do not know what is a narrow channel, how can they apply the rule ? For example while COLREGS has defined the responsibilities in a narrow channel, it fails to define narrow channel. ![]() It is also about navigators being crystal clear about rule of the roads and all the terms used in it.īut not all the terms used in COLREGS are simple or easy to understand. But safe navigation is not only about steering a ship. If it wasn’t about safe navigation, no ship would reach its destination safely.
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