The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.

PROP. IX. Part of the Distance being given, To find the Remainder of the Distance.

Let part of the Distance given be AB 96 Feet, and the Remainder of the Distance cannot be measured, by reason of danger of Shot, or Moat of Water, or some other Impediments; Therefore by the 7 Rule I found the Angle at B to be 44 deg. 55 min. So that the Angle BED 45 deg. 05 min. is the Complement thereof: Which known, I say,

As the Radius	10
To the Sine of the Angle BED 45 deg. 5 min.	985011
So is the Distance from the Eye BE 135 6/10 Feet	313225
To the Remainder of the Distance BD 96 Foot	298236