Decription GPS Server
A GPS server is a computer with a rednet wifi modem that when asked will tell passing computers / turtles where it is its location in X , Y , Z .This combined with the distance from the sever allows a computer / turtle to locate where it is. the turtle must have this information from four different severs so it can Trilateration its location. This group of turtles is called a GPS cluster.
The way the severs are positioned has an affect on how accurate / reliable your system is. In Picture one you can see that i have computers In a pattern that pattern allows the position to be found in X Y and Z if you have four computers in a line along Y It would not be able to identify its hight or its X position. You must have computers on different locations. My recommendation is to use the below configuration I use it all the time ant it is very accurate affective and compact.
[EDIT] I derped Hard This is the Correct Picture [/EDIT]
After setting up four computers in this pattern at the top of the world.Set up a startup file on each computer with the continence as the picture shown.Put this in a file named startup
shell.run("gps","host",x,y,z)replace the x y z with numbers from the picture
Example computer A's startup file would contain
shell.run("gps","host",0,3,255)after this reboot the computer's and repeat the process for the other three computers using the numbers from the picture.
You should now be able to check GPS coordinated from any where within a 370 Meter radius of the cluster.
For more information on the math behind GPS see http://en.wikipedia....i/Trilateration
For more information on coordinate systems see http://en.wikipedia....ordinate_system
Make a turtle with wifi and run gps locate. it should show position. use go to move the turtle and check again with gps locate
Download [CC_1.41] BENCH v1.3 multi porous testing utility using Turtle Driver option press "g" to check for GPS location.
I hope this was helpful as the GPS system is extremely useful.
GPS builder program
neonerz has created a automatic build script for GPS satellites