| No. | Station Name | Lat. | Long. | Since | Note |
| 1 | Manila, South Harbor | 14 35N | 120 50E | 1947- | GLOSS 73 |
| 2 | Jolo, Sulu | 06 04N |
121 00E |
1947- |
GLOSS 70 |
| 3 | Legaspi, Albay | 13 09N |
123 45E |
1947- |
GLOSS 72 |
| 4 | Davao, Davao Gulf | 07 05N |
125 38E |
1948- |
GLOSS 71 |