The survey of the coastline and Inner Passage to the northward was here commenced, and afterwards continued up to Torres Strait, by an unbroken series of triangulation; it included a space varying in width from 5 to 15 miles, extending through 7 1/2 degrees of latitude and 4 1/2 of longitude, with a coastline of upwards of 600 miles.
MODE OF CONDUCTING IT.
The programme of the survey may be briefly given as follows: at the principal stations--chiefly islands off the coast--the various observations for determining astronomical positions and theodolite angles, were made by Captain Stanley and Mr.W.H.Obree, and the ship remained there at anchor for several days.

Meanwhile, Lieutenant Dayman, in the Asp, laid down the coastline and neighbourhood as far as the next station twenty or thirty miles in advance.

Lieutenant Simpson with the pinnace continued the soundings several miles further out, both working in conjunction, and often assisted by another boat in charge of Mr.
Heath, while the outside soundings devolved upon Lieutenant Yule in the tender.

The Rattlesnake in shifting from place to place, aided by boats in company, sounded the centre of the channel, usually following one of the lines run by Captain P.P.King, and marked upon his charts.

The available boats permanently attached to the ship, were employed under various officers in the neighbourhood of the different anchorages, cutting up the ground, and filling up any gaps which might otherwise have been left in the new charts.
The summit of a very small rocky island, near the anchorage, named by Captain Stanley, Mound Islet, formed the first station.