- The Simulation spawns 100 particles in a circle around the entered position. The radius controls the size of the circle. If you are uncertain about the position of an object you can increase the radius. The result will be more spread out, too. + The Simulation spawns 100 particles in a circle around the entered position. The radius controls the size of the circle in meters. If you are uncertain about the position of an object you can increase the radius. The result will be more spread out, too.
A position reported by an aircraft is typically precise to 1 nautical mile, that corresponds to a radius of 926 meters. A position reported by GPS can be very precise and corresponds to a radius of 5m. @@ -82,7 +82,7 @@
latitude=33.333;longitude=14.444;duration=48;start_time=2022-12-10 00:00:00;object_type=27
{{ SERVER_EMAIL }}
+ Send the e-mail to {{ SERVER_EMAIL }}
- The starting points of the simulated particles are marked with green dots. If the particle ends up floating in water at the end of the simulation, the particle is marked blue. If the particle ends up on shore, it is marked green. + The starting points of the simulated particles are marked with green dots. If the particle ends up floating in water at the end of the simulation, the particle is marked blue. If the particle ends up on shore, it is marked red.
The image shows the trajectories of particles from the starting points to the ending points. The color of the trajectories incdicates the position of a particle at a given time. For example the color green always shows the position of the particles after ~50% of the simulated time range, while orange shows the positions at ~75%. @@ -101,18 +101,15 @@
This is a fictional case as an example of how this tool can be used.
- You open the leeway tool in the browser, and fill out the form: - It is the 4th Jan 2023 12:34 local time and you are being alerted by an airplane about fishing vessel adrift in position 37° 30'N 18°37'E. Your position is 38° 10.1532'N 018° 33.3832'E, that means you are 40nm away and with your top speed of 10kts it takes you 4 hours to reah the last known position. The contact to the drifting vessel is lost and the airplane can not stay on scene so you decide to run a drift simulation. + It is the 4th of Jan 2023 12:34 local time and you are being alerted by an airplane about a fishing vessel adrift in position 37° 30'N 18°37'E. Your position is 38° 10.1532'N 018° 33.3832'E, that means you are 40nm away and with your top speed of 10kts it takes you 4 hours to reach the last known position. The contact to the drifting vessel is lost and the airplane can not stay on scene so you decide to run a drift simulation. You open the leeway webtool and start to fill out the form:
| Latitude | -37° 30' | --> Last known Latitude | +Latitude | +37° 30' | +-> Last known Latitude |
|---|---|---|---|---|---|
| Longitude | 18°37' | @@ -148,7 +145,7 @@
- You recive an Email with the simulation result. It is clear the the boat is likely to drift North to South-East-East so you set your course to 171 to position 37.5°N 18,68°. From that point you should be able to spot the drifting vessel if the weather conditions are good. + You recive an e-mail with the simulation result. It is clear the the boat is likely to drift North to South-East-East so you set your course to 171 to position 37.5°N 18,68°. From that position you should be able to spot the drifting vessel if the weather conditions are good.