Yet another challenge at sea is multipath due to reflections off the water. To get a GNSS fix as quickly as possible, they keep very good track of time and, also, use very good ephemeris. Submarines, which run in smooth water when they are immersed, are subject to the same dynamics as surface vessels when they emerge. CAST simulators are also able to generate scenarios based on recorded data. To simulate conditions on small vessels - such as Coast Guard rescue launches - which are much less stable than large ships, users can shorten the period of the sea state. They can then tweak these parameters and re-run the simulation. For example, users might specify the height of the waves, their direction, and the number of seconds between crests. Typically, a customer will run a simulation in which sea state starts out mild and gets increasingly harsh, using theoretical models of sea states.
By contrast, antennas on ships often move by several tens of feet for every foot of motion of the deck because, to give them an unobstructed view of the sky, they are typically placed atop masts, which act as long lever arms.ĬAST simulators can simulate these somewhat chaotic dynamics of ship antennas in rough seas, thereby presenting to a GNSS receiver the same motion that it would see on a real ship. Even though aircraft roll every time they change heading, their antennas move only a very short distance because they are never far from the aircraft’s center of rotation. Additionally, wave action is more complicated than air turbulence. In calm seas when a ship turns it does not roll at all. Unlike aircraft, for which rolling is a necessary and inevitable part of a heading change, ships roll only as a function of sea state.
Simulator users enter the values for 12 variables (see the screenshot below) and the simulator does the rest. It is an extremely dynamic environment because waves generated by ocean surface stress evolve from wind waves to swell through nonlinear dynamical processes.CAST Navigation’s simulators recreate all these conditions-including roll, pitch, yaw, and sea state period and direction-in a laboratory, enabling the efficient testing of naval navigation equipment without the need for expensive and dangerous sea trials.
Ship simulator extremes rough seas professional#
The content should never be used to substitute professional advice or education.For many applications, in addition to knowing a platform’s position it is nearly as important to know its attitude, which consists of three rotational components-roll, pitch, and yaw-and three linear ones-heave, surge, and sway. Although every effort has been made to ensure the content is accurate and up to date, it remains the responsibility of the viewer to determine its accuracy and validity. DISCLAIMER-Īll content on this channel is provided for entertainment purposes only. Music & Sounds Effects by Epidemic Sound () *Everyone becomes a part of our community, but additional rewards will depend on the tier you select. When you join, you will become part of an Exclusive Community, gain Early Access to our YouTube videos*, receive Exclusive Content* and have influence over Community Videos* We have launched a new community of maritime enthusiasts over on Patreon. In this video we take a look at the basics of ship handling, illustrating how a cruise ship can manoeuvre in a tight space. Join our Exclusive Community over on Patreon: