| Administrative History | John Heron was possibly an officer or seaman on board the Royal Charlotte, sailing from Greenock in 1810. |
| Description | John Heron's Instructions in Navigation, beginning with geometrical definitions, then plane trigonometry, explanation of the compass, log-line and half-minute glass, plane sailing, compound courses or traverse sailing, parallel sailing, middle latitude sailing and Mercator's sailing, calculation of latitude, and journals of voyages from Ryde to Lisbon and back in 1784 and from Bristol to Gibraltar and back (taken as examples), 1810. |
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