The southeast portion of the grid is located nearest to Laiya River. In fact, the Municipal Boundary Monument (M.B.M.) No. 13 along the southeast boundary of Palacpac is less than 5 kilometers from the shores of Sigayan Bay in Laiya, San Juan, Batangas.
Grid Squares
There are 7 longitudinal sections numbered 01 to 07 starting at 121°9'00"E and ending at 121°23'00"E. Each of these sections is 2 minutes wide and is divided into North-South sections 2 minutes long from 13°52'54.80"N to 13°41'00"N latitudes.
There are 31 quadrants or grid squares comprising the proposed municipal grid. Each square is 2 minutes wide and 2 minutes long with an area of about 1,329 hectares more or less.
Reference System
The grid squares are numbered first to the west (01 to 07), and then to the south (01 to 06). The main reason for this reference system is the location of the Poblacion area which is the northwestern portion of the municipality.
Consequently, grid squares are referenced by quoting the longitudinal section number, followed by the latitudinal section number. For example, the Poblacion area is mainly in Quadrant 02-02 while the Tombol Hill is straddling Quadrants 02-01 and 02-02.
Grid Location
The following table shows the location of each of the 31 quadrants in the proposed Rosario Municipal Grid:
| GRID | North | South | East | West |
| 01-01 | 13°53'00"N | 13°51'00"N | 121°11'00"E | 121° 9'00"E |
| 01-02 | 13°51'00"N | 13°49'00"N | 121°11'00"E | 121° 9'00"E |
| 01-03 | 13°49'00"N | 13°47'00"N | 121°11'00"E | 121° 9'00"E |
| 02-01 | 13°53'00"N | 13°51'00"N | 121°13'00"E | 121°11'00"E |
| 02-02 | 13°51'00"N | 13°49'00"N | 121°13'00"E | 121°11'00"E |
| 02-03 | 13°49'00"N | 13°47'00"N | 121°13'00"E | 121°11'00"E |
| 03-01 | 13°53'00"N | 13°51'00"N | 121°15'00"E | 121°13'00"E |
| 03-02 | 13°51'00"N | 13°49'00"N | 121°15'00"E | 121°13'00"E |
| 03-03 | 13°49'00"N | 13°47'00"N | 121°15'00"E | 121°13'00"E |
| 03-04 | 13°47'00"N | 13°45'00"N | 121°15'00"E | 121°13'00"E |
| 04-01 | 13°53'00"N | 13°51'00"N | 121°17'00"E | 121°15'00"E |
| 04-02 | 13°51'00"N | 13°49'00"N | 121°17'00"E | 121°15'00"E |
| 04-03 | 13°49'00"N | 13°47'00"N | 121°17'00"E | 121°15'00"E |
| 04-04 | 13°47'00"N | 13°45'00"N | 121°17'00"E | 121°15'00"E |
| 04-05 | 13°45'00"N | 13°43'00"N | 121°17'00"E | 121°15'00"E |
| 04-06 | 13°43'00"N | 13°41'00"N | 121°17'00"E | 121°15'00"E |
| 05-01 | 13°53'00"N | 13°51'00"N | 121°19'00"E | 121°17'00"E |
| 05-02 | 13°51'00"N | 13°49'00"N | 121°19'00"E | 121°17'00"E |
| 05-03 | 13°49'00"N | 13°47'00"N | 121°19'00"E | 121°17'00"E |
| 05-04 | 13°47'00"N | 13°45'00"N | 121°19'00"E | 121°17'00"E |
| 05-05 | 13°45'00"N | 13°43'00"N | 121°19'00"E | 121°17'00"E |
| 05-06 | 13°43'00"N | 13°41'00"N | 121°19'00"E | 121°17'00"E |
| 06-01 | 13°53'00"N | 13°51'00"N | 121°21'00"E | 121°19'00"E |
| 06-02 | 13°51'00"N | 13°49'00"N | 121°21'00"E | 121°19'00"E |
| 06-03 | 13°49'00"N | 13°47'00"N | 121°21'00"E | 121°19'00"E |
| 06-04 | 13°47'00"N | 13°45'00"N | 121°21'00"E | 121°19'00"E |
| 06-05 | 13°45'00"N | 13°43'00"N | 121°21'00"E | 121°19'00"E |
| 06-06 | 13°43'00"N | 13°41'00"N | 121°21'00"E | 121°19'00"E |
| 07-01 | 13°53'00"N | 13°51'00"N | 121°23'00"E | 121°21'00"E |
| 07-02 | 13°45'00"N | 13°43'00"N | 121°23'00"E | 121°21'00"E |
| 07-03 | 13°43'00"N | 13°41'00"N | 121°23'00"E | 121°21'00"E |
Global Positioning System
The Sustainable Development Action Officer in charge of the Office of the Municipal Planning and Development Coordinator is proposing this Rosario Municipal Grid for the purpose establishing a quick reference system based on the Rosario Cadastre 426-D to define the position of a point anywhere in the Municipality of Rosario which can be used in combination with a Global Positioning System (GPS) equipment.
