SUBSIM Radio Room Forums - (Shipping Lanes ) Curiosity note

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- - (Shipping Lanes ) Curiosity note (https://www.subsim.com/radioroom/showthread.php?t=207122)

Hardigen

09-01-13 04:06 PM

(Shipping Lanes ) Curiosity note

In the Thread [ shipping lanes ] I was 12nm out of Naha waitin for nightfall to close, well ! I got a bit closer in daylight to about 8 nm,when I could see a smoke cloud coming from the port, nosing a bit closer but watching the draft cos the seabed comes up quite shallow there and a enemy Destroyer goin ape all around me , I saw a large Merchant blazing away with only its Prow touching the water ,the rest of the ship was in the air at an angle of about 70 degrees from the horizontal. I know its just a mistake made by the game producers but what struck me as odd is when I was studying navigation many years ago the distance to the sea horizon in miles is the square root of your height multiplied by 8 ,then divide by 7, the angle of dip in Minutes is the square root of the height of your EYE multiplied by .98. If these calculations are correct my scope must have been at least 49 feet up int air. Maybe sub scopes could do that , I don,t want to slag off my only enjoyment cause I really enjoy the hunt but maybe you lads out there can throw some light on the puzzle. Keep Huntin you Guys. H:hmm2:

TorpX

09-01-13 10:53 PM

If I'm reading you correctly, you're saying that you were able to see much farther than you should have been able to.

Sadly, the game does not use a spherical model of the earth. You can see as far from a low periscope as you can from the bridge of a surface vessel. Additionally, one cannot see farther than 10 nm under any circumstances. This seems rather unfortunate, as in SHCE the simulation allowed one to see father from a high periscope than a low one. I can only hope that there will be a future sub simulation that takes these things into account.

Sailor Steve

09-01-13 11:59 PM

I've also heard that SHCE modeled a round world. I don't remember.

Quote:

Originally Posted by TorpX (Post 2108895)

Additionally, one cannot see farther than 10 nm under any circumstances.

In real life? Only at sea, or on land as well? From the signal bridge of a battleship to the mast of another battleship? Please clarify.

Hardigen

09-02-13 06:49 AM

THanks Torp and Sailor for your prompt replies ,the reference books on Large circle trigonometry I no longer have ,no reference was made as to being on land so it is to be taken that we assume we are on board . Torp has mentioned that 10nm can only be seen under any circumstances and the fact that the game is on a flat plain answers the question, I never got to use these calculations in the real world but they were the easiest to remember . H

CapnScurvy

09-02-13 07:41 AM

Here's a good scale graph I've used for determining "How far away is the horizon?"

Atmospheric conditions will of course interfere with your results (so will old age :O:).

Hardigen

09-02-13 03:07 PM

You could be right about old age Capn and thnx for the Graph , Depending how clear the day is ,standing on a 100 foot cliff lookin out to sea you should be able to see about 11 miles ,of course if your eyesight is good ! take care all H:)

Scurvy Dawg

09-02-13 05:25 PM

Quote:

Originally Posted by Hardigen (Post 2109119)

I vividly remember as a child standing on the White Cliffs of Dover (St Margarets Bay/ Kingsdown) and looking across the English Channel and seeing France. The cliffs are around 300 feet and France is approx 20 miles away- so your graph is spot on!

Remember thinking that those 20 miles seemed so little yet they kept us British safe from invasion on more than one occasion!

TorpX

09-02-13 11:34 PM

Quote:

Originally Posted by Sailor Steve (Post 2108908)

In real life? Only at sea, or on land as well? From the signal bridge of a battleship to the mast of another battleship? Please clarify.

I mean the game horizon goes no farther than 10 nm. (Unless someone has modded something better?) I certainly didn't mean to say that in RL, nothing can be seen beyond 10 nm.

This made me think of a passage in the book, Sunk!, by Capt. Hashimoto. In it, he mentions looking through the periscope and seeing a blur, which he took to be a cloud at first, then realized was Guam, from a distance of 26 mi. [The highest point on Guam is 1,332 ft. according to Wekipedia]. So, it is certainly possible to see large land masses at a much farther range than we can, in game.

This 10 nm. horizon was a pet peeve of mine, since I had formerly been trying to use "Celestial Navigation", and found, I could never see any mountains beyond 9.9 nm., or so.

in_vino_vomitus

09-03-13 03:15 AM

Just to throw a mountaineering example into the mix - on a clear day on the summit of K2 the horizon is about 200 miles away

Shame I'll never get there :(

Sailor Steve

09-03-13 08:41 AM

Quote:

Originally Posted by TorpX (Post 2109276)

I mean the game horizon goes no farther than 10 nm. (Unless someone has modded something better?) I certainly didn't mean to say that in RL, nothing can be seen beyond 10 nm.

Ah, got it. I wasn't sure, so I asked. :sunny:

Quote:

This made me think of a passage in the book, Sunk!, by Capt. Hashimoto. In it, he mentions looking through the periscope and seeing a blur, which he took to be a cloud at first, then realized was Guam, from a distance of 26 mi. [The highest point on Guam is 1,332 ft. according to Wekipedia]. So, it is certainly possible to see large land masses at a much farther range than we can, in game.

WOW! :o

That's pretty darned impressive! I wouldn't have thought that possible, through a periscope. Thanks for pointing that out.

Quote:

This 10 nm. horizon was a pet peeve of mine, since I had formerly been trying to use "Celestial Navigation", and found, I could never see any mountains beyond 9.9 nm., or so.

I thought the SH4 default was 20 km, or about 12 nm. Not much of a difference, but still either one is far better than the SH3 default of 8 km, or 5 nm. I'm pretty sure they did it to account for computer limitations at the time, but I also agree that a realistic distance would be nice.

Rockin Robbins

09-03-13 12:32 PM

Quote:

Originally Posted by in_vino_vomitus (Post 2109311)

Just to throw a mountaineering example into the mix - on a clear day on the summit of K2 the horizon is about 200 miles away

Shame I'll never get there :(

Heck, a good number of people who DO get there don't get there. There's no safe way up K2. If it wants to kill you (and much of the time it does) you're just dead. There's no mitigating hazards on that mountain. You just roll the dice and hope it doesn't come up snake eyes. If you made it, it isn't because you're better than the guys who didn't. It just means you were foolhardy but lucky.

It's much cheaper to juggle vials of nitroglycerin and you have a little bit more control with the nitro.:D

We had a guy on Subsim who walked across Antarctica, from one shore to the opposite and through the pole. That dwarfs any mountain climb in sheer human exertion and tolerance for pain. I'm glad someone did it, but have no desire to try something like that myself.

Armistead

09-03-13 12:46 PM

I'm not smart as you guys with math, but I learned as a kid the higher I climbed a tree the further I could see.

fireftr18

09-03-13 02:41 PM

Quote:

Originally Posted by Rockin Robbins (Post 2109447)

You got that right. I like some good adventure. I even spent 23 years of my life going into burning buildings. To climb Everest or hike Antarctic, uhh, no thanks!

in_vino_vomitus

09-03-13 02:44 PM

Quote:

Originally Posted by Rockin Robbins (Post 2109447)

Yeah - they don't call it The Savage Mountain for nothing - but it looks so sexy, and something's going to get you - Might as well be pretty :)

TorpX

09-04-13 12:14 AM

Quote:

Originally Posted by Rockin Robbins (Post 2109447)

We had a guy on Subsim who walked across Antarctica, from one shore to the opposite and through the pole. ... but have no desire to try something like that myself.

Me neither. I'd settle for reading the book, or watching the movie.

Maybe SubSim should have an Athletic Award?

Quote:

Originally Posted by Sailor Steve (Post 2109387)

I thought you might find this item interesting.

I was using the then current version of RFB; not sure about what the stock horizon is. I didn't try to pin down the exact limit, but I know I couldn't see anything beyond 10 nm.

I don't see why a computer game could not show distant land masses. I know large convoys, ports, and detailed landscapes make for a strain on the graphics end of things, but when we see distant mountains, all we really expect to see is a hazy gray shape, with little, if any, detail. So, perhaps they could configure a game with individual ships/planes/land units rendered out to 10 mi., convoys rendered as a puff of smoke or gray blurb, out to 20 mi., and land masses rendered out to 30 mi. Wouldn't this be possible?

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