Kilometers vs Nautical miles

Brag · 01-20-07, 09:12 AM

This question been bothering me since SHIII came out. Since the nautical mile (1 sec of arc-1851 meters) been the standard for sea navigation, is it historically correct to use kilometers? Did the Kriegsmarine navigators convert miles to kilometers for their plots? I find it annoying to have to convert to and from kilometers in the different calculations one needs to do in SHIII. :hmm:

01-20-07, 09:46 AM

hmmm

Historicaly correct to use Km's - yes i'd say so. The calculations they did at the time is by using Km's and you dont need to convert it.

ex. plot contacts with 3 minutes 15 sec. interval - the plot will show the speed of the target by measuring the range between plots and multiplying the kilometers with 10.

Example the target plots out to have 0.500 km's between plots - aka 5 knots.

Range to the TDC - Kilometers

length of ship in the recognitions handbook - meters

No need to convert anything.

Corsair · 01-20-07, 11:14 AM

Except when you need to calculate distances from speed/time, but thats where the 2 sheets top left from map screen come handy...

Sailor Steve · 01-20-07, 11:17 AM

Quote:

Originally Posted by Mav87th

Example the target plots out to have 0.500 km's between plots - aka 5 knots.

5 knots is 5 nautical miles in an hours, not one-half of a kilometer (0.500).

01-20-07, 12:06 PM

Sailor Steve - read it again :hmm:

A quick edit might save your "Skipper of the month" nomination..

ahh heck let me make it easy for you - the example i drew there - - 3:15 minute rule plot.....

Quote:

ex. plot contacts with 3 minutes 15 sec. interval - the plot will show the speed of the target by measuring the range between plots and multiplying the kilometers with 10.

Example the target plots out to have 0.500 km's between plots - aka 5 knots.

Corsair · 01-20-07, 03:57 PM

I am still surprised that sailors, even german, would use kilometers on sea maps as noone else does. The good reason being that 1 nautical mile = 1 minute of a meridian which makes it easy to measure distances as these degrees and minutes are on the sides of the map to indicate latitude. That's how all seamen in the world do when working on a map...

Sailor Steve · 01-20-07, 04:23 PM

Quote:

Originally Posted by Mav87th

Sailor Steve - read it again :hmm:

A quick edit might save your "Skipper of the month" nomination..

ahh heck let me make it easy for you - the example i drew there - - 3:15 minute rule plot.....

Quote:

ex. plot contacts with 3 minutes 15 sec. interval - the plot will show the speed of the target by measuring the range between plots and multiplying the kilometers with 10.

Example the target plots out to have 0.500 km's between plots - aka 5 knots.

Okay, I understand. I'm old, I miss some things.

01-20-07, 06:11 PM

You have my vote Steve.....

And remember - old farts are usualy those that smell best

And Corsair - the explanation might lie in the fact that today even - german television shows movies with german voiceover. No "Yeehaa Jesters dead" in TopGun - nahaa "Ach Sehr Gut - Jester sind tot!"

Living right next door to them, able to take german television, i have never understood it.......well apart from the porn.

Corsair · 01-21-07, 07:03 AM

That's now five years I am living in the "inside" side of the door, so I get to understand it pretty well now. Although I spend a lot of time on the international french TV5 channel so I don't forget my original language...
My main problem in the beginning was that each region has its own dialect - germans from Hamburg don't understand germans from Munich - which is very different from what you learn in school.
Like one of my german friends told me in the beginning : The main difference between Germans and foreigners living in Germany is that foreigners speak German...

Hylander_1314 · 01-21-07, 12:44 PM

This was discussed in the SHIV forum, as nautical miles are designed to be used with latitude and longitude. And since the game map doesn't use "real" navigation, it's a bit of a moot point, really. That's where converting to km would be a pain, when you have a certain point to reach, using latitude and longitude, with the time equations figured in.

don1reed · 01-21-07, 02:19 PM

Quote:

This question been bothering me since SHIII came out. Since the nautical mile (1 sec of arc-1851 meters) been the standard for sea navigation, is it historically correct to use kilometers? Did the Kriegsmarine navigators convert miles to kilometers for their plots?

All Navies and Sailors measure distance their ship travels across the surface of an ocean in Nautical / Sea miles. (NOT kilometers or Statute miles.) All positions are notated in Latitudes and Longitudes (or Kriegsmarine codes during WWII). Positions were anotated after celestial fix by measuring distance along either the east or west NEAT LINE of the CHART (Latitude).

Nautical mile = 1/60 of 1° of Latitude. 1 minute of arc.

Depth is measured: in feet, fathoms, & meters.

Range to target: yards, meters, & nautical miles.

Take your pick.

Corsair · 01-21-07, 03:57 PM

Thks for the picture, that's exactly what I was trying to explain...

PS : wow, love my new avatar, may be I should stop posting to keep it a while...lol

01-20-07, 09:12 AM	#1
Brag Navy Seal Join Date: Nov 2006 Location: Docked on a Russian pond Posts: 7,072 Downloads: 2 Uploads: 0	Kilometers vs Nautical miles This question been bothering me since SHIII came out. Since the nautical mile (1 sec of arc-1851 meters) been the standard for sea navigation, is it historically correct to use kilometers? Did the Kriegsmarine navigators convert miles to kilometers for their plots? I find it annoying to have to convert to and from kilometers in the different calculations one needs to do in SHIII. :hmm: __________________ Espionage, adventure, suspense, are just a click away Click here to look inside Brag's book: Amazon.com: Kingmaker: Alexey Braguine: Books Order Kingmaker here: http://www.subsim.com/store.html For Tactics visit:http://www.freewebs.com/kielman/

01-20-07, 11:14 AM	#3
Corsair Ace of the Deep Join Date: Nov 2006 Location: Toulouse France Posts: 1,140 Downloads: 51 Uploads: 0	Except when you need to calculate distances from speed/time, but thats where the 2 sheets top left from map screen come handy... __________________ NYGM 3.4A / Living SH3 V5.1 + SH3 Commander

01-20-07, 03:57 PM	#6
Corsair Ace of the Deep Join Date: Nov 2006 Location: Toulouse France Posts: 1,140 Downloads: 51 Uploads: 0	I am still surprised that sailors, even german, would use kilometers on sea maps as noone else does. The good reason being that 1 nautical mile = 1 minute of a meridian which makes it easy to measure distances as these degrees and minutes are on the sides of the map to indicate latitude. That's how all seamen in the world do when working on a map... __________________ NYGM 3.4A / Living SH3 V5.1 + SH3 Commander

01-21-07, 07:03 AM	#9
Corsair Ace of the Deep Join Date: Nov 2006 Location: Toulouse France Posts: 1,140 Downloads: 51 Uploads: 0	That's now five years I am living in the "inside" side of the door, so I get to understand it pretty well now. Although I spend a lot of time on the international french TV5 channel so I don't forget my original language... My main problem in the beginning was that each region has its own dialect - germans from Hamburg don't understand germans from Munich - which is very different from what you learn in school. Like one of my german friends told me in the beginning : The main difference between Germans and foreigners living in Germany is that foreigners speak German... __________________ NYGM 3.4A / Living SH3 V5.1 + SH3 Commander

01-21-07, 12:44 PM	#10
Hylander_1314 Sea Lord Join Date: May 2006 Location: 5 Miles Inland West Of Lake Huron Posts: 1,936 Downloads: 139 Uploads: 0	This was discussed in the SHIV forum, as nautical miles are designed to be used with latitude and longitude. And since the game map doesn't use "real" navigation, it's a bit of a moot point, really. That's where converting to km would be a pain, when you have a certain point to reach, using latitude and longitude, with the time equations figured in. __________________ A legislative act contrary to the Constitution is not law. -John Marshall Chief Justice of the Supreme Court ---------------------

01-20-07, 09:46 AM	#2
Mav87th Stowaway Posts: n/a Downloads: Uploads:	hmmm Historicaly correct to use Km's - yes i'd say so. The calculations they did at the time is by using Km's and you dont need to convert it. ex. plot contacts with 3 minutes 15 sec. interval - the plot will show the speed of the target by measuring the range between plots and multiplying the kilometers with 10. Example the target plots out to have 0.500 km's between plots - aka 5 knots. Range to the TDC - Kilometers length of ship in the recognitions handbook - meters No need to convert anything.

01-20-07, 06:11 PM	#8
Mav87th Stowaway Posts: n/a Downloads: Uploads:	You have my vote Steve..... And remember - old farts are usualy those that smell best And Corsair - the explanation might lie in the fact that today even - german television shows movies with german voiceover. No "Yeehaa Jesters dead" in TopGun - nahaa "Ach Sehr Gut - Jester sind tot!" Living right next door to them, able to take german television, i have never understood it.......well apart from the porn.

01-21-07, 03:57 PM	#12
Corsair Ace of the Deep Join Date: Nov 2006 Location: Toulouse France Posts: 1,140 Downloads: 51 Uploads: 0	Thks for the picture, that's exactly what I was trying to explain... PS : wow, love my new avatar, may be I should stop posting to keep it a while...lol __________________ NYGM 3.4A / Living SH3 V5.1 + SH3 Commander