if not netNav then
	if not os.loadAPI("netNav") then
		error("could not load netNav API")
	end
end

for _, side in ipairs(redstone.getSides()) do
	if peripheral.getType(side) == "modem" then
		rednet.open(side)
	end
end

netNav.setMap("main", 30)
 
local tArgs = {...}
if #tArgs == 3 then
	for i = 1, #tArgs do
		if tonumber(tArgs[i]) then
			tArgs[i] = tonumber(tArgs[i])
		else
			error("argument "..i.." must be a valid coordinate")
		end
	end
	print(netNav.goto(tArgs[1], tArgs[2], tArgs[3]))
else
	error("arguments must be 3 or 4 numbers")
end