Notice is hereby given to all mariners and other parties concerned that:
1. Reference: Letter from Engr. Joel Cabal of Trinav Surveys Inc. dated January 11 2018.
2. The Trinav Surveys, Inc., a Philippine based company has been contracted by Cavitex Holdings, Inc to conduct Marine Geophysical Survey for Sangley International Airport in Cavite. The survey will be undertaken between 15 January 2018 and 29 February 2018 using local registered boats, bounded by the following coordinates:
| POINT | LONGITUDE | LONGITUDE |
| SOP 1 | 120.88449 | 14.46800 |
| SOP 2 | 120.86257 | 14.49335 |
| SOP 3 | 120.90561 | 14.52867 |
| SOP 4 | 120.92817 | 14.50257 |
| SOP 5 | 120.92020 | 14.48188 |
3. In this connection, all ships/watercrafts transiting the vicinity of the above-mentioned areas are advised to take note of the information and take necessary precautionary measures.
4. The cooperation of all concerned in effecting the widest dissemination of this information is requested.