At the south-west end of the southernmost island, where the strait is narrowest, and not more than one mile and a quarter wide, there is a patch of rocks in the centre, which always shows: the channel on the north side of these rocks is the best: the water is very deep, and the tide sets right through.
(*Footnote.

The latitude of the observatory was taken every day during our stay, using the sea-horizon, but the effect of refraction was so great that the daily observations varied as much as 3 minutes 43 seconds.
The mean of 15 meridional altitudes with the sextant made the latitude 15 degrees 6 minutes 22.5 seconds, and of fourteen observations with the circle 15 degrees 6 minutes 13.8 seconds.
Mean for the latitude of the observatory 15 degrees 6 minutes 18 seconds South.
The longitude was deduced by the mean of the observations of our two visits; namely, in October, 1820, and August, 1821: the latter were taken at Sight Point, in Prince Regent's River, the difference of the meridians of the two places, by chronometers and survey, being 8 minutes 52.8 seconds.
1820.

September 28 and 29.

By twenty sets of lunar distances with the sun, containing one hundred sights with the sextant, the sun being to the east of the moon, the longitude is 125 degrees 11 minutes 24.3 seconds.
1821.

August 2nd and 3rd.