gps

local clock = os.clock
function sleep(n)
local t0 = clock()
while clock() - t0 <= n do end
end

function getGPS()
    local f=fs.open("/data/homepos", "r")
    local tbl = textutils.unserialise (f.readAll())
    f.close()

    local curx, cury, curz = gps.locate(5)

    local distx = curx-tbl.x
    local disty = cury-tbl.y
    local distz = curz-tbl.z

    local distsum=distx+disty+distz

    local absdist=math.abs(distsum)

    print ("I am "..math.floor(absdist+0.5).."m away from home")
    sleep(0.1)
    term.setCursorPos(1,1)
    term.clear()
    term.setCursorPos(1,1)

end

while true do
 getGPS()
end