| EPSG | description | |
|---|---|---|
| 24821 | This code is for UTM zone 21N using PSAD56. Mining, gas, and old maps commonly use this code. | |
| 32621 | This code is for UTM zone 21N using WGS84. Other government departments and newer maps not related to mining and gas tend to use this code. | |
| 4326 | This code describes longitude / latitude pairs. |