Originally Posted by
Saladman
On marine charts distances are in nautical miles .
As a nautical mile is defined to be a minute of latitude, it makes perfect sense when using a sextant.
The OP may find the Reg online standards converter useful; it allows conversion to suitable units such as swimming pools (volume), Wales (area), double decker buses (length), etc:
https://www.theregister.com/Design/p...converter.html