Notice is hereby given to all mariners and other parties concerned that:
1. Reference: Letter from Engineer Douglas Mercurio Trinav Surveys, Inc dated 20 February 2018.
2. Trinav Surveys, Inc., a Philippine based company has been contracted by Cavitex Holdings, Inc to conduct Marine Geophysical Survey for Sangley International Airport Project in Cavite bounded by the following coordinates:
| Point | Latitude | Longitude |
| SOP 1 | 14° 44905 North | 120° 87663 East |
| SOP 2 | 14° 46880 North | 120° 85918 East |
| SOP 3 | 14° 47371 North | 120° 86524 East |
| SOP 4 | 14° 49173 North | 120° 84970 East |
| SOP 5 | 14° 52927 North | 120° 89557 East |
| SOP 6 | 14° 49496 North | 120° 92524 East |
| SOP 7 | 14° 48188 North | 120° 92020 East |
3. In this connection, all ships/watercrafts transiting the vicinity of the abovementioned areas are advised to take note of the information and take necessary precautionary measures at all times.
4. The cooperation of all concerned in effecting widest dissemination of this information is requested.