| Clue | Source | Date |
|---|---|---|
| Mariner's navigational tool | Universal | 07 May 2025 |
| Flow chart? | New York Times | 01 Dec 2023 |
| Chart of the Pacific, e.g | Premier Sunday | 02 Jan 2022 |
| Aid for a submarine captain | New York Times | 13 Jul 2017 |
| Aid for a submarine captain | ||
| Seaman's aid | New York Times | 01 May 2016 |
| Mariner's aid | ||
| Mariner's aid | ||
| Nautical chart | ||
| Nautical chart | ||
| Depth chart? | ||
| Depth provider |