GPS Altitude Error !?!?!? - Page 2

aguila · 10-13-2004, 03:18 PM

I live below sealevel, but my GPS does not seem to believe this (it shows 60 meters + !!

Marsupial · 10-13-2004, 03:33 PM

you live under sea level, so you have a subputer?

lol

Change · 10-13-2004, 06:37 PM

Quote: Originally Posted by VanMan69

I'm going to assume the military uses something more sophisticated than a $60 GPS mouse to guide their cruise missiles.

A bit

Actually, civilian GPS receivers are required to stop tracking if they detect some particular set of speed and altitude conditions.

chenko · 10-13-2004, 07:11 PM

The "Sea Level" IIRC, is taken from a nail in a dock wall on the south coast of the UK somewhere, well that is what OS uses.

I have a BU-303 and its altitude isnt far off for my location.

Quote: Originally Posted by VanMan69

I'm going to assume the military uses something more sophisticated than a $60 GPS mouse to guide their cruise missiles.

That and they have the <1m accuracy which we don't

we could get that accuracy too without much hassle, but civvies are not allowed

TruckinMP3 · 10-13-2004, 07:55 PM

Quote: Originally Posted by kiltjim

I'm not an expert, so I couldn't tell you if the sea level in specific areas differs around the globe. I always thought sea was pretty much at the same level globally except for the tides.

I would think it would be the GPS. Older GPS units had error built in, so that you couldn't build a rocket with pin point accuracy. If you look at the raw stream of GPS data, you will see that it jumps around alot. VisualGPS shows you this. While monitoring mine over a day or so, it jumped upto 500'. Download it, and just have your GPS sit on you desk for a day or so. That should tell you if its the GPS, or the sea, or whatever.

Some famous harbor on the east coast of Canada (I think) has a 20 Plus foot difference between high and low tide. Most of the coastal plains arround the US are a few feet at most. (this from the guy in Colorado = land locked

)