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Originally a US military project, GPS is now considered a dual-use technology, meaning it has significant military and civilian applications. During the Cold War, a Korean Air Lines Flight got a bit lost on a flight from New York to Seoul and strayed into Russian Air Space, and was shot down by the Soviets, there were more than 250 casualties.As a result, Reagen announced that GPS (which previously was only accessible to the military due to encryption on the satellites), would become available to all civilians, in order to stop this from happening again.Find it here: Korean Air Lines Flight 007But doesn’t that put the military in a fix? How do they leverage from GPS then?The US Military still reserves the right to temporarily disable GPS for non-military use in certain areas (for example, I know it was disabled over Iraq, at least at the beginning of the war. I'm not so sure if it's still disabled).Also they get more information out of GPS signals as discussed later in this answer.If the satellites are 'broadcast only ' and they are transmitting "blindly" to the Earth, how can the US military disable it for certain areas?There are primarily two codes that are transmitted from satellites (yes, yes I know this is changing). These codes are the C/A code and the P code. C/A is civilian access and P is military. The main difference between the two is that P offers a higher degree of accuracy (obviously) through a much longer and more complicated algorithm.The main way that you can stop GPS from being used is to jam the frequencies. This is done by broadcasting a loud signal over the C/A code frequency from the ground. Sort of like how you can't hear a conversation at a concert - the noise around you is just too loud. However, the P code is at a different frequency, so jamming at the C/A frequency won't affect the military GPS. Keep in mind that GPS signals are buried in the noise floor (very, very, very weak). You don't need a strong jammer to block the signal.The P code is encrypted such that you have to have a very complicated algorithm to decode it.Note that if you were to try and build your own GPS jammer, you would probably be arrested. It's illegal. It's also not very hard to track down the signal much as it's not very hard to find the screaming kid in a daycare at naptime.Is it possible to disable GPS for an entire country? Or can the signals be jammed for small areas only?One can only jam small areas. But think about cell phone towers. They provide cell signal to huge ranges of people. Now imagine if that was a GPS jammer. For an operation as big as the US military, it wouldn't be too hard to set up a few of those and boom. An entire country is jammed. Throw it on a predator drone and now you have an unmanned mobile jammer.What stops the "enemies" to jam P code frequency? Is it the encryption?Nothing really stops enemies from jamming the P code. However, there are signal techniques in place to make it harder to jam than the C/A code. But when you think about it, guerilla fighters (such as in the war that the US was fighting in Iraq) wouldn't want to broadcast such a loud signal. The US can pretty much take out anything, anywhere against such a small guerilla force. And a P-code GPS jammer would be so easy to find that it would be destroyed fairly quickly.Think of it like how I said above. There's a daycare at naptime, everyone is quiet. Then, all of a sudden, one kid starts screaming. While it's a little harder in reality than in this example, the principle remains the same. It's really, really easy to find the source of a loud signal at a certain frequency.

Opening an account was a hassle with them misplacing some form but it was done in 20 days or so.The platform is neat. Their windows platform didn’t work for me, but their web interface is decent enough. Their rates also seem competitive and they’re now branching to include more options like mutual funds.I’ve had no issues with intraday trades so far until I made a delivery trade.The money was deducted from my account. I waited an entire week and the position was still not updated in my account. I emailed them and the guy says my “power of attorney” is still not processed.It’s incredible. I was able to make intraday trades and buy a delivery equity but I’m not allowed to take possession ? So meanwhile I just have to sit and watch as the equity tanks (hope it doesn’t).That to me seemed very irresponsible. They shouldn’t allow customers to buy stuff when they’re not in a position to take delivery of it. Open the account only after all your paper work is done or atleast have the courtesy of informing the client regarding the situation so they’re not caught off guard.Other than that, the platform and UI is very nice. They don’t have nation-wide presence but you can mail them forms in case you want to convert your physical shares to demat. Also, their support is pretty good.Overall, I’d give them a 4\5.