The seaman's daily assistantbeing a short, easy, and plain method of keeping a journal at sea; in which are contained, rules, shewing how the allowances for lee-way, variation, heave of the sea, set of currents, &c. are to be made, and to correct the dead-reckoning by an observation, in all cases: and also all the tables that are any ways necessary for the seaman's use in keeping a journal
Printed for J. Mount and T. Page, on Tower-Hill1770-01-01
