USS San Francisco

This is a discussion on USS San Francisco within the A Brief History of Cprogramming.com forums, part of the Community Boards category; Originally Posted by adrianxw Sorry to be a bore, but if they were travelling in "uncharted waters", not using an ...

  1. #16
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    Quote Originally Posted by adrianxw
    Sorry to be a bore, but if they were travelling in "uncharted waters", not using an active bottom sensing sonar or whatever is simple negligence?

    I do not believe the US Navy operates in uncharted waters by the way. Why be afraid of giving your position away to a geological feature? Who is the enemy here you are avoiding? Sounds, (groan), like some cartographic surveying was in order, and justified.

    The whole point of submarines is that their position is a secret. Take that away and they might as well just be another boat.

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    Handy Andy andyhunter's Avatar
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    Sorry to be a bore, but if they were travelling in "uncharted waters", not using an active bottom sensing sonar or whatever is simple negligence?
    They weren't in uncharted waters. The map in use did not have the mountain on it.

    Who is the enemy here you are avoiding?
    Noone, standard operating practice is to not give ones position away just because. The world is not a friendly place.
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    Quite literally, the world is not a friendly place, as technically that's what they crashed into.
    See you in 13

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    Presumably the fishies aren't friendly either, they either give you a whack or try to hump you.

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    doesnt sonar works the same way a radar works? for example send a singnal, the signal bounces off an object and when the signal returns back then you know the distance of the sub from the object?
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    Handy Andy andyhunter's Avatar
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    That would be active sonar, and then yes - big picture the same.

    Now that is something that is not used normally since it gives away your position - just like radar.

    Usually we "listen" to determine what is going on around us - aka who is where.
    i don't think most standard compilers support programmers with more than 4 red boxes - Misplaced

    It is my sacred duity to stand in the path of the flood of ignorance and blatant stupidity... - quzah

    Such pointless tricks ceased to be interesting or useful when we came down from the trees and started using higher level languages. - Salem

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    Quote Originally Posted by InvariantLoop
    doesnt sonar works the same way a radar works? for example send a singnal, the signal bounces off an object and when the signal returns back then you know the distance of the sub from the object?
    it works like eyes, if it's dark you turn a torch on and you can see stuff, but usually stuff is lit up anyway so you don't need your torch.

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    Handy Andy andyhunter's Avatar
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    it works like eyes, if it's dark you turn a torch on and you can see stuff, but usually stuff is lit up anyway so you don't need your torch.
    ?
    I think you are talking about infra-red and infra-green technology.

    Which by the way is very cool to use.
    i don't think most standard compilers support programmers with more than 4 red boxes - Misplaced

    It is my sacred duity to stand in the path of the flood of ignorance and blatant stupidity... - quzah

    Such pointless tricks ceased to be interesting or useful when we came down from the trees and started using higher level languages. - Salem

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    Mayor of Awesometown Govtcheez's Avatar
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    Infra-green?

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    Quote Originally Posted by andyhunter
    ?
    I think you are talking about infra-red and infra-green technology.

    Which by the way is very cool to use.
    I was trying to explain the whole passive sonar idea. You don't really get passive radar.

  11. #26
    Handy Andy andyhunter's Avatar
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    yep, new improved infra-red.

    Uses a smaller wavelength aka green light vice red light so the pictures are crisper and you can make out more stuff. It turns out that the human eye can interpret more shades of green thus more elaborate shading and object viewing can occur.

    [edit]
    Oh, i get you Brian. Sorry about that. Yes, normally stuff makes a lot of noise so you don't need to bounce anything off them.
    [/edit]
    i don't think most standard compilers support programmers with more than 4 red boxes - Misplaced

    It is my sacred duity to stand in the path of the flood of ignorance and blatant stupidity... - quzah

    Such pointless tricks ceased to be interesting or useful when we came down from the trees and started using higher level languages. - Salem

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    Quote Originally Posted by andyhunter
    ?
    I think you are talking about infra-red and infra-green technology.

    Which by the way is very cool to use.
    I think his analogy works... It's a little contrived, but it works.
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  13. #28
    and the hat of wrongness Salem's Avatar
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    Perhaps it was one of these new stealth mountains which roam around the world's oceans undetected
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  14. #29
    It's full of stars adrianxw's Avatar
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    They weren't in uncharted waters. The map in use did not have the mountain on it.
    So they were in fact. Surely using a map that does not include significant topographic features is, by definition, working uncharted?

    I find it hard to believe an outfit like the US Navy does not have at least an idea of where there are and are not mountains. If they genuinely did not have an adequate map, I think it is absolutely ludicrous that they would drive around at high speed in expensive pieces of kit without looking where they were going.

    Negligence. What could it otherwise be described as?
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    Handy Andy andyhunter's Avatar
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    It was an error with the map. Now I am not going to get into a discussion involving the events that led to that error as the investigation is still going on, but when the investigation is over and the results published I would be glad to discuss it.
    i don't think most standard compilers support programmers with more than 4 red boxes - Misplaced

    It is my sacred duity to stand in the path of the flood of ignorance and blatant stupidity... - quzah

    Such pointless tricks ceased to be interesting or useful when we came down from the trees and started using higher level languages. - Salem

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