Turtle GPS Framework

rednet.open("right")
shell.run("clear")
print("Please ensure that I am facing North.")
print("If I am not facing North, I will not make it to my destination.")
sleep(5)
print("Beginning journey in...")
print("5")
sleep(1)
print("4")
sleep(1)
print("3")
sleep(1)
print("2")
sleep(1)
print("1")
sleep(1)
print("Beginning journey now.")

local x, y, z = gps.locate()

function ymoveup()
updist = 10
    repeat
        turtle.up()
        updist = updist - 1
    until updist == 0
    updist = 10
end

function zmove()
    if z > 1096 then
        zdist = z - 1096
        repeat
            turtle.forward()
            zdist = zdist - 1
        until zdist == 0
    end
    if z < 1096 then
        zdist = z - 1096
        zdist = zdist * -1
        turtle.turnRight()
        turtle.turnRight()
        repeat
            turtle.forward()
            zdist = zdist - 1
        until zdist == 0
        turtle.turnRight()
        turtle.turnRight()
    end
    turtle.turnLeft()
end

function xmove()
    if x > 251 then
        xdist = x - 251
        repeat
            turtle.forward()
            xdist = xdist - 1
        until xdist == 0
    end
    if x < 251 then
        xdist = x - 251
        xdist = xdist * -1
        turtle.turnRight()
        turtle.turnRight()
        repeat
            turtle.forward()
            xdist = xdist - 1
        until xdist == 0
        turtle.turnRight()
        turtle.turnRight()
    end
end

function ymovedown()
    y = y + updist
    ydist = y - 68
    repeat
        turtle.down()
        ydist = ydist - 1
    until ydist == 0
    turtle.turnRight()
end

function finished()
    shell.run("clear")
    print("Destination reached.")
    print("I am a good turtle.")
    print("Please pet me.")
end

ymoveup()
zmove()
xmove()
ymovedown()
finished()