Well, a couple of years ago you had trouble finding charts of the Chesterfield Reefs
FYI, the US Hydrographic Office has a 2008 version of its "Sailing Directions Enroute" covering the East Coast
of Australia and offshore
Here's what it says about the Chesterfield group:
6.11 Chesterfield Reefs, with Loop Islet (19°58'S., 158°
28'E.) near their S end, consists of three narrow reefs which
extend 9 miles N and 27 miles NW, respectively, from South
, their S extremity.
6.11 South Elbow
(19°59'S., 158°29'E.), on which there is a
meteorological station, is well marked by Loop Islet, a flat,
tufted islet, 3.4m high, just inside the reef. The inner edge of
the reef extending N from South Elbow is bordered by numerous
shoal patches, some of which are steep-to.
6.11 The Anchorage Islets (19°54'S., 158°28'E.) are a group of
islets on the inner edge of the reef, 5 miles N of Loop Islet. An
isolated underwater dangerous rock lies 1.2 miles NNW of
Loop Islet. The third islet from the N, the highest, is 11.6m
high. The islets and dry sand cays on the reef add to its elevation,
and form a natural breakwater from E. There are numerous
wrecks on the islets.
6.11 Anchorage.—There is good anchorage in convenient depths
inside Chesterfield Reefs in the SE part, sheltered from N
through E and S through W. The chief precaution in anchoring
is to select a sandy area on which to anchor
room, between the below-water coral
6.11 The greater part of this area inside the reefs has regular
depths of 37 to 53m, but on the E side numerous steep-to
patches have been seen. A below-water reef, dark in color and
difficult to discern, and dangerous even to boats, lies 5 miles W
of the highest of the Anchorage Islets. A number of other
patches have been reported inside the reef and can best be seen
on the chart. The positions of the patches are approximate.
6.11 The best anchorage is 0.5 mile W of the highest of the Anchorage
Islet (Bennett Islet) (19°55'S., 158°22'E.),
12.5m high, lies 7 miles NW of South Elbow, 0.2 mile SE of
the narrow passage
from which it takes its name. The passage
is 0.2 mile wide, with a depth
of 14.6m in the center of the
fairway. Several sand cays lie on the reef SE of the islet. A
strong 3 knot
sets through it in a S or N direction.
6.12 From the above passage, the SW side of the reef extends 4.5
miles NW, and close within the NW end is Long Island
small low islets lie on the reef between the passage and Long
Island. Shoals, with depths of 2.1 to 2.7m, lie 0.1 mile off the
reef on the NE side of Long Island
6.12 Long Island (19°52'S., 158°19'E.), 6.1m high, is the largest
of Chesterfield Reefs. A monument stands near the middle of
the NE side of the island; a small bush-covered cone stands on
its NW end. A boat passage is available through the reef; in
boats may pick their way past the dangers lying
NE of the monument.
6.12 Anchorage.—Anchorage may be obtained, in a depth of
27m, 0.6 mile NE of the monument, or in 24m, 0.7 mile NNE
of the monument on Long Island.
6.12 Long Island Passage (19°51'S., 158°17'E.), between Long
Island and the S end of the W reef, is 2.5 miles wide. The S
side of this passage has depths of 11 to 40m; the N side appears
to be deeper.
6.12 From Long Island Passage, the W side of Chesterfield Reefs
extends 14 miles NNW to Northwest Point and is steep-to on
side. The reef encloses a lagoon
at its S end, between
that point and a sand cay 2 miles N of it. Farther N there
are some small sand cays and boulders, mostly awash."
You can download the entire Sailing Directions for any region here: Maritime Safety Information