Why is speed through water used in collision avoidance?
Speed through the water (STW) is the speed of the vessel referenced to the water in which it is navigating. In general, STW is used for radar collision avoidance to provide a more accurate indication of the target’s aspect and SOG is used for navigation.
Which speed is used for collision avoidance?
Collision avoidance by braking is appropriate at low vehicle speeds (e.g. below 50 km/h (31 mph)), while collision avoidance by steering may be more appropriate at higher vehicle speeds if lanes are clear.
What is speed over ground compared with speed through water in using for collision avoidance explain?
Speed Over the Ground (SOG) is the speed of the vessel relative to the surface of the earth. Speed Through Water (STW) is the speed of the vessel relative to the water. It is possible for the STW to be zero while the SOG is 5 knots, for example if the boat was drifting in a 5 knot current.
Is water speed different than land speed?
Speed over ground is the speed of the ship with respect to the ground or any other fixed object such as fixed buoy or island. Speed through water is the speed of the ship with respect to the water such as anything floating on water.
What is SOG and COG?
COG, Course Over Ground, indicates the direction of the boat’s heading relative to the land. Over ground means “in relation to the earth”, see also the term SOG. Therefore, COG means the true direction free from the effects of sea currents.
What is the difference between course over ground and heading?
Course Over Ground (COG) is the actual direction of motion (the intended direction of travel). While heading is the direction in which a vehicle/vessel is pointing at any given moment (https://www.applanix.com/news/blog-course-heading-bearing/).
Can you interpret of speed through water?
Interpretation of Speed Through water As you would have noticed, current has nothing to do with speed over water. Irrespective of how much current you have, the speed over water will remain same.
What does SOG mean military?
Military Special Operations Group
Military. Special Operations Group (disambiguation), special forces teams.
What does SOG mean in boating?
Speed Over Ground
SOG. Speed Over Ground. This differs from boat speed- so for example if your boat is stationary in the water, it may still be moving in relation to the land due to current and wind etc.
What is the difference between a heading and a bearing?
Heading is the direction the aircraft is pointing. The aircraft may be drifting a little or a lot due to a crosswind. Bearing is the angle in degrees (clockwise) between North and the direction to the destination or nav aid.