General Instructions for Surveying', possibly written byMajor James Rennell, ca February 1791 (Series 60.05) - No. 0022

[Page 22]

have that position marked by a dot (•) so the mode by which it was so determined shall be described by adding as many of the following Marks as may serve to express it

• * A position determined by Celestial Observation for the Longitude on shore
• [O with cross in centre] Longitude by Time Keeper
• [O with line in centre] Latitude by Observation
• O Lat. by Account
• [triangle] By Intersection of Bearings with 2 or more broken lines pointing to the Stations or Transit objects
• [O with dot in centre] Surveying Stations the Day Month & Year to be added together with If at Anchor to be added proper marks to denote whether the Station was determined by Angles Latitude & Longitude or merely from the ships Course & distance. If [so an?] Anchor [drawing of anchor] to be added.
• > Positions resting on one Bearing & estimated distance - a broken line to point to a Station from whence it was set.

___  Tract of the ship a faint line - The Consort may put [square with dot in centre] to    denote her Stations 
=== Measured Bases a double Line
~~~ The surveyed part of the Coast an unshaded black line of moderate Strength. The sketched part in red but  all the objects       line of ye Coast & what lies to Seaward of the  to be in black as the Marks will sufficiently discriminate the Data. The face of the Country to be expressed in Writing whether woody or Naked &c
It will be understood of Course that when a particular part of a Round or very wide Cape or Promontory (such as Cape Comorin the start point &c has been determined, that the part or Parts the Start Point so determined are to be Distinguished by) a dot or dots. If such a Promomtory has any conspicuous Hill or