Quote:
Originally Posted by Leoz
...
10. If you need to do a "wire method", and a 78 meter long ship covers its own length in 30 seconds, 78 divided by 30 is 2.6, then times 2.6 by 1.85 for 4.81. Round up, the ship is probably going 5 knots.
...
|
That is using the wrong conversion factor. And rounding up to hide the error.
In order to convert from meters to nautical mile, and from seconds to hours the correct conversion factor is multiply by 3600 (to go from seconds to hours) and then divide by 1852 (to go from meters to nautical miles. In the end that comes down to multiplying by 1.944, or 2 if you want to do it simple and quick. (and still be within 3% close to exact)
Also, there is no reason to round it up to a single digit. Speeds can be any decimal number. If a unit moves at that speed it is likely due to the lazyness of the campaign/mission creator.
Quote:
|
14. Where you can get directly ahead of a target from distance and see it from zero angle on the bow. Plot that line and you have the ships course. Then go off to the side and plot bearings. If it moved 600 meters down that line in 3.25 seconds, it is going 6 knots.
|
3.25 minutes, as in 3 minutes 15 seconds (or 194.4 seconds. Looks familiar?
) , not 3.25 seconds.
Other than that, good approach to tracking a target. Let the plot show it's movement and speed over multiple/tens of minutes. That's where accuracy is shown.