PDA

View Full Version : Question about ship speed and distance.

dtindc70
07-15-2005, 01:25 PM
So, I spot a ship going 7 Kts. To me, that ship is traveling seven nautical miles per hour.

If I want to plot the distance that I think the ship will travel within one hour, I figure that's about 24500 meters. My thought process is 3500 meters per mile, so that's how I arrive
at this figure.

Something tells me this computation isn't quite accurate - namely, I undershoot most of the ships. Can someone provide a little insight on how many meters a 7 kt ship will travel in an hour?

Thanks...

lecek
07-15-2005, 03:19 PM
7 * 1.85 (rough) = 12.95 Kilometers. I just go with 13.

1 Nautical mile = 6000(+) yards = around 5500 Meters.

panthercules
07-15-2005, 09:43 PM
Originally posted by lecek:
7 * 1.85 (rough) = 12.95 Kilometers. I just go with 13.

1 Nautical mile = 6000(+) yards = around 5500 Meters.

Not exactly - actually, a nautical mile = 6,000 FEET, i.e., only 2,000 yards (just slightly longer than the 1,760 yards in a regular mile), so roughly 1,850m per nautical mile

Grey004
07-16-2005, 11:44 AM
Roughly estimating if a ship is moving at 7knts in 1 hour it has travelled 11.2kms,working on the theory that,1 nautical mile is equal to 1.2land miles and 8kms is equal to 5 miles.

Therefore to simplify the calculated distance,just multiply the speed the ship is travelling (x) by 1.6 then multiply that by time travelled you should come up with the optimal distance your target should be at.

It may sound a bit iffy but its the method I use to get ahead,and be lying in wait for my victim.

Kuikueg
07-16-2005, 12:08 PM
You could try this easy mental calculation method:
Take the speed in knots, double it four times and set the decimal point one place backwards. I.e:

7 knots -> 14 -> 28 -> 56 -> 112 -> 11,2 Kms/h

I find this easy and fast to do, as normaly you have a whole number for the speed in knots.

Queequeg

AT_Hawk_1970
07-17-2005, 06:38 AM
Originally posted by lecek:
7 * 1.85 (rough) = 12.95 Kilometers. I just go with 13.

1 Nautical mile = 6000(+) yards = around 5500 Meters.
It's too many farmers playing maritime simulators http://forums.ubi.com/groupee_common/emoticons/icon_biggrin.gif
1 nm mile = 1853 meter
1 sea mile = 4 nm
That why some oldtimers still call a nm for a quartermile.

From a CO
CO = Chief Officer

Mylo42
07-17-2005, 08:49 AM
Get the Nomo mod. It's a very handy little graph that is on your nav map that allows for calculating speed, distance, time. I find it very useful and from what I understand, it is a tool that was actually used.

dtindc70
07-18-2005, 10:52 AM
Where can one find the Nomo mod? (or most mods, for that matter)

Mylo42
07-18-2005, 12:24 PM
Many mods on http://www.subsim.com