Le 06/10/2011 19:58, Jim Henderson a écrit :
> Guns are kinda necessary.  GPS?  Useful, but if they don't have coverage 
> for some reason, it's not a deal killer.  After all, having a map also is 
> useful, or having local knowledge of the area.

Point taken.
But you need to train all the men to read map. Some would fails. And the
one who succeed might engage in a big no-no: reflection.

Why waste resources to train the ground men, when all they need is to
trust the technology. Easier to replace separate parts.

Remember: CCCP soldiers always travelled as a pack of three. One that
could read, one that could write and one to keep watch of these two
dangerous intellectuals.

> 
>> > The point isn't that the USMC wouldn't exist without GPS. It's that GPS
>> > is valuably enough for them to pay for it, even if it didn't benefit
>> > anyone else.
> That's not what you said, though, you said it *needs* GPS to exist.  It 
> doesn't need it, it's just a very useful tool so they know where they are 
> without resorting to other methods.

The real interest of GPS is low flying cruise missiles (well, the one
you fire about 500 miles aways from the target, from your boat or
whatever, and that play hide & seek with defense radars.)

From satellite & planes photographic analysis (on background, from the
1950 cold war), you get a very detailled map of position & elevation.
But you need a GPS in the missile to actually be able to use the
relevant data.

(and military precision of GPS is not 30m... it's 0,30 m with adequate
receivers : you need to decypher the P part, and perform dual reception
on L1 & L2 bands to compensate the random ionospheric transmission.)

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