COS MASTER - IMO 9929405 -
| Name | : | COS MASTER |
| Former names | : | - |
| New names | : | SeaZip 11 (since 2025) |
| IMO number | : | 9929405 |
| Type | : | Monomaran, Supply vessel, crew tender |
| Built | : | 2021 |
| Length | : | 27,27 m |
| Beam | : | 9,80 m |
| Draught | : | 1,80 m |
| Speed | : | 20 knots, 27 knots (max) |
| Bollard Pull | : | 20 t |
| Capacity | : | crew 5 max. / industrial personnel 30 |
| Owner | : | CoastWise Offshore Service, Lauwersoog - The Netherlands |
| Manager/operator | : | SeaZip Offshore Service, Harlingen - The Netherlands |
| Flag | : | The Netherlands |
| Port of registry | : | Lauwersoog |
