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@ -12,7 +12,7 @@ # Setting up GPS
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The @{gps} API allows computers and turtles to find their current position using wireless modems.
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In order to use GPS, you'll need to set up multiple *GPS hosts*. These are computers running the special `gps host`
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program, which tell other computers the host's position. Several hosts running together are known as a *GPS
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program, which tells other computers the host's position. Several hosts running together are known as a *GPS
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constellation*.
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In order to give the best results, a GPS constellation needs at least four computers. More than four GPS hosts per
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@ -22,7 +22,7 @@ ## Building a GPS constellation
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<img alt="An example GPS constellation." src="/images/gps-constellation-example.png" class="big-image" />
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We are going to build our GPS constellation as shown in the image above. You will need 4 computers and either 4 wireless
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modems or 4 ender modems. Try not to mix ender and wireless modems together as you might get some odd behavior when your
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modems or 4 ender modems. Try not to mix ender and wireless modems together as you might get some odd behaviour when your
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requesting computers are out of range.
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:::tip Ender modems vs wireless modems
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@ -47,13 +47,13 @@ ## Building a GPS constellation
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Let's get started building the constellation! Place your first computer in one of the corners of your 6x6x6. Remember
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which computer this is as other computers need to be placed relative to it. Place the second computer 4 blocks above the
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first. Go back to your first computer and place your third computer 5 blocks in front of your first computer, leaving 4
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blocks of air between them. Finally for the fourth computer, go back to your first computer and place it 5 blocks right
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blocks of air between them. Finally, for the fourth computer, go back to your first computer and place it 5 blocks right
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of your first computer, leaving 4 blocks of air between them.
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With all four computers placed within the 6x6x6, place one modem on top of each computer. You should have 4 modems and 4
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computers all within your 6x6x6 where each modem is attached to a computer and each computer has a modem.
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Currently your GPS constellation will not work, that's because each host is not aware that it's a GPS host. We will fix
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Currently, your GPS constellation will not work, that's because each host is not aware that it's a GPS host. We will fix
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this in the next section.
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## Configuring the constellation
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@ -76,7 +76,7 @@ ## Configuring the constellation
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To hide Minecraft's debug screen, press <kbd>F3</kbd> again.
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Create similar startup files for the other computers in your constellation, making sure to input the each computer's own
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Create similar startup files for the other computers in your constellation, making sure to input each computer's own
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coordinates.
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:::caution Modem messages come from the computer's position, not the modem's
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@ -94,3 +94,16 @@ ## Configuring the constellation
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computers get their location, they use MC's command system to get their block which returns that in MC's coordinate
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system.
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:::
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:::caution The accuracy problem
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At extreme ranges, our small 6x6x6 block GPS constellation may not be able to disambiguate some locations from others.
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A symptom of this happening is not being able to locate yourself while being in range of the GPS computer's modem messages.
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You can confirm that this is the issue by running the GPS program `gps locate` on the symptomatic computer, if it outputs
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`Ambiguous position` then you have this problem.
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To fix the problem, you can either add more GPS constellations or move the host computers in your problematic constellation
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further away from each other. Putting them in the corners of their chunk is a good option, just make sure to move the one
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that is above the others up by a similar distance.
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![An example large GPS constellation.](/images/gps-constellation-example-large.png){.big-image}
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:::
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