UDYZ 4000N/04500E 4000N/04500E 3900N/04800E 3900N/05200E 3800N/05600E 3700N/05900E 3600N/06300E 3500N/06600E 3300N/06900E 3200N/07200E 3000N/07500E 2900N/07800E 2700N/08100E 2600N/08400E 2400N/08700E 2200N/08900E 2100N/09200E 1900N/09400E 1700N/09700E 1400N/10100E 1400N/10100E 1400N/10100E 1400N/10100E VTBS