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Driftwood
Joined: 04 Apr 2004
Posts: 289
Location: Western NC
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 Posted: Sun Jan 09, 2005 5:21 pm Post subject: Navigation Question |
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| When computing navigational times/distances are maritime speeds(knots) basically nautical miles per hour? |
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Scion
Joined: 31 May 2001
Posts: 1552
Location: New Zealand
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| Posted: Sun Jan 09, 2005 5:27 pm Post subject: |
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| Quote: | http://www.dictionary.com
1. Nautical. A division on a log line used to measure the speed of a ship.
2. Abbr. kn. or kt. A unit of speed, one nautical mile per hour, approximately 1.85 kilometers (1.15 statute miles) per hour.
3. A distance of one nautical mile.
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Driftwood
Joined: 04 Apr 2004
Posts: 289
Location: Western NC
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| Posted: Sun Jan 09, 2005 5:32 pm Post subject: |
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Thanks Scion!  Should have thought of using a dictionary myself! :doh: |
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Rip
Joined: 09 Nov 2004
Posts: 324
Location: Right behind you!
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| Posted: Tue Feb 08, 2005 1:40 am Post subject: |
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I find it helpful to use the 3 minute rule. Speed in kts x100=distance travelled in 3 minutes in yards.
At
5kts you will go 500yds in 3 minutes
7kts=700yds
10kts=1000yds
25kts=25yds |
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Driftwood
Joined: 04 Apr 2004
Posts: 289
Location: Western NC
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| Posted: Tue Feb 08, 2005 11:30 am Post subject: |
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| Thanks again for the reply Rip. I was posing the question primarily for long transit purposes. I was (and still do) use the 3 minute rule for shorter distances but found that trying to use it for longer distances was very cumbersome. |
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Rip
Joined: 09 Nov 2004
Posts: 324
Location: Right behind you!
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| Posted: Tue Feb 08, 2005 3:23 pm Post subject: |
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| lrankine wrote: | | Thanks again for the reply Rip. I was posing the question primarily for long transit purposes. I was (and still do) use the 3 minute rule for shorter distances but found that trying to use it for longer distances was very cumbersome. |
Roger, and that is fairly easy. 2000yds is a NM. As long as you don't need mph or kph etc it is easy. Now meters and feet is a pain. It is wise to chose depths that are not even increments of your opponents system. For instance I never travel at 500 ft because it is too neat 150 meters. |
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