NTRIP client 가까운 mount point 잡아서 network RTK 실행 Hardware configuration Serial Novatel ProPak 6 COM1 to /dev/ttyS0 Novatel ProPak 6 COM2 to /dev/ttyS1 Usage sudo chmod +x /dev/ttyS0 /dev/ttyS1 ./run_ntrip.sh