Hatfield
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GPS is satellite based, off of 4 satellites, that is why it is slower, for example if you have a handheld device (Garmin) they take a little time to lock in on a satellite, especially indoors, I remember placing mine in the window to get a faster lock. With aGPS, over 90% of all cell phones use, it is much faster as it only has to use cell phone towers to triangulate your location. However cell phones will use your data, whereas GPS uses satellites that are free as long as you own your device.
and yes aGPS can be very accurate to a very close proximity, GPS can pinpoint to within 3 feet.
Somewhat OT
Right. Real GPS is fascinating to me. I have a hand held unit that I use when hiking in woods.
It is wonderful. I never go in the woods without it anymore. I bring a spare set of batteries too and I am very careful to not drop it because I pretty much rely on it.
I can go into unfamiliar heavy woods and before I leave my truck I mark my trucks position in a landmark and store it and make sure its stored.
Then get this. I turn off the GPS unit and put it in my backpack. LOL
Then I walk randomly deep in the woods wherever I want to. Then whenever I want to return to my truck I pull out my GPS and do a GOTO truck landmark. It tells me the direction in degrees and also tells me the distance.
It is wonderful and such a piece of mind because as I head towards my truck I watch the distance get shorter and shorter and I know I am going in right direction.
It is the most amazing thing I have ever used. I love it.
I do use a compass too because I have found that the compass helps me walk to the degrees the GPS unit told me to go. Its just easier for me to use it that way. So if my GPS says my truck is at 55 degrees. Then I put the GPS away and use compass to head at a 55 degree heading. Then every now and then I pull out the GPS to check to see what degrees to go and how much farther. It usually is different because I tend to not stay on perfect heading. So the next time I pull it out it may say 48 degrees.
As the distance goes down it lets your mind know you are going to the truck and you are NOT lost. It is wonderful and I recommend anyone who does hiking or anything in the woods to always have one and learn how to use it. It is a very helpful tool.
The GPS does have to lock onto satellites and so sometimes you have to walk to a clearing where not too many thick trees but it usually finds the satellites even in thick cover. Sometimes it takes quite a few minutes to lock down on the satellites but I have never had it fail me ever.
Just dont break it or let your batteries die down. LOL
An interesting thing is I heard where the military who controls GPS can purposely degrade the signal at times but I think that was years ago and since GPS is very popular now I think the military does not degrade the signal much at all. They were testing a feature where they could block the GPS signals in case of missile attack which makes sense but that would only be done if we were under attack.