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| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | North Central | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grid numbers along the top margin representing longitude relative to a central meridian, likely based on the Paris Meridian or a similar European standard adapted for Chinese readers. |
| 48 | 49 | 50 | 51 | 52 | 53 | 54 |
|---|---|---|---|---|---|---|
| Grid numbers along the bottom margin representing degrees of latitude North. |
Phonetic Transliteration (Yiyin): The method used by 19th-century Chinese scholars, such as Wei Yuan in the Illustrated Gazetteer of the Maritime Kingdoms, to represent foreign sounds using Chinese characters with similar pronunciations.