print("Checking fuel")
if turtle.getFuelLevel() < 250 then
    print("Refueling......")
    turtle.refuel(1)
else print("Getting ready")
end

local Sx, Sy, Sz = gps.locate()
print("Detected starting point ("..Sx..","..Sy..","..Sz..")")
local home = ("("..Sx..", "..Sy..", "..Sz..")")

local yTarget = -60
function goTo(Sx, yTarget ,Sz)
    while yTarget < Sy do
        turtle.digDown()
        turtle.down()
    end
    while yTarget > Sy do
        turtle.digUp()
        turtle.up()
    end
end