Blue Moon is a named anchorage on the outer face of North Head listed by Vizzbud without description beyond its position, depth range (12 m average, 28 m maximum), Open Water rating and its neighbours: Checkpoint Charlie 300 m away, Runway 700 m and Rock Fall 900 m. It sits on the same collapsed-cliff coastline as Bluefish Point, between the Bluefish grey nurse sites and the tip of the headland, and everything about the dive follows from that. The structure will be a slope of fallen sandstone blocks from the cliff foot to a sand line in the mid-20s, with short walls and overhangs where the blocks stack, kelp on the shallow rock and sponges, sea tulips and gorgonians on the shaded faces below 15 m.

The marine life of the whole outer North Head face is consistent: wobbegongs and Port Jackson sharks in the boulders, eastern blue groper, giant cuttlefish in winter, weedy sea dragons in the kelp, bull rays on the sand, schools of yellowtail and pomfret over the reef, kingfish along the edge, and the occasional grey nurse shark from the Bluefish colony. Visibility is the ocean side's 8–15 m, more in clean current. It suits Open Water divers upward in settled weather, and confidence in every field here is low.

Boat only, 15 minutes from Manly Cove or Little Manly ramp on the ocean side of North Head, 300 m from Checkpoint Charlie and 700 m from Runway; part of the Manly operators' outer North Head rotation in settled weather. Dive Centre Manly loads at Manly Cove beach, Pro Dive Manly and Sydney Dive Charters at the Little Manly ramp (Stuart Street; parking and benches); private boats launch at Little Manly or Rose Bay. The skipper anchors on the boulder slope in 12–15 m or drops divers to drift along the cliff with the tide.

Exposed ocean face of North Head: only dived in settled seas under 1.5 m from the south or east, with morning departures before the north-easter; current along the cliff line; best water in winter. Charters fall back to the inner Heads when it is rough. Visibility is typically 8–15 m, more in clean East Australian Current water, and summer brings a thermocline at 15–20 m.

Descend to the reef top at 10–12 m, work down the boulder slope with the cliff on one side to the sand at 24–28 m, follow the sand edge for ten minutes, then return shallower through the boulders and overhangs to a safety stop against the reef; DSMB ascent.

Dive Centre Manly, Pro Dive Manly and Sydney Dive Charters cover this face on outer North Head boat dives; not separately scheduled or described by any operator.