GEBCO 2019 TID - Grid Mask (0)
| 44 - Bathymetric sounding - grid |
| 70 - Pre-generated grid |
GEBCO 2019 TID - Interpolated Mask (1)
| 40 - Predicted based on satellite-derived gravity data |
| 41 - Interpolated based on a computer algorithm |
| 42 - Digital bathymetric contours from charts |
| 45 - Predicted helicopter/flight |
| 71 - Unknown source |
| 72 - Steering points |
|