Andy's Postcard is a pinnacle on Ribbon Reef No. 5. Morris Nautical, which runs a Ribbon Reef itinerary, describes it as a pinnacle featuring hard corals, lionfish, nudibranchs, octopus and schooling trevally and barracuda. It is listed on Mike Ball Dive Expeditions' Cod Hole–Ribbon Reefs itinerary map among the southern Ribbon Reef sites with Clam Beds, Steve's Bommie and Flare Point, and a ScubaBoard trip report from the Nimrod Explorer liveaboard mentions it as a pinnacle-style dive with diverse marine life.

The name suggests a picture-perfect scene, and the pinnacle format matches other celebrated sites on the Ribbons such as Steve's Bommie and Pixie Pinnacle: a coral column rising from sand, with hard corals on the top, overhangs and crevices on the flanks, and schooling fish circling in the blue. Trevally and barracuda schools provide the action, while lionfish and octopus are among the resident critters. Nudibranchs are common on the coral.

Published details are thin. The site does not have its own page in the Mike Ball or Spirit of Freedom guides, and depths here are estimates based on comparable Ribbon Reef pinnacles. Expect the usual southern Ribbons fauna: anemonefish, fusiliers, sweetlips, whitetip reef sharks, turtles and, in June and July, the chance of dwarf minke whales, which are regularly encountered around Ribbon Reef No. 3 nearby.

It suits intermediate divers comfortable ascending in open water. Anyone booking a southern Ribbons itinerary can ask whether it is on the plan. It deserves a better write-up than currently exists, and divers who log it can help by recording depths and highlights.

Liveaboard only (or fly-dive via Lizard Island). Mike Ball Dive Expeditions' Spoilsport and Spirit of Freedom depart Cairns (Trinity Wharf / Marlin Marina) in the evening and steam north overnight, roughly 12–14 hours and 200–250 km, to reach the Ribbon Reefs by morning; some itineraries fly Cairns–Lizard Island (about one hour, scenic flight along the coast) and board or disembark there. Trips run 3–7 nights and include Andy's Postcard on some southern Ribbon Reef itineraries.

Divers enter by giant stride from the dive deck at the mooring and descend the mooring line. It is one of the southern Ribbon Reef moorings on Mike Ball's map (with Clam Beds, Steve's Bommie and Flare Point) and is dived from the mooring.

The Ribbon Reefs sit on the edge of the continental shelf and take the full south-east trade wind from April to October. Lagoon-side moorings stay diveable in 20–25 knot SE winds, but reef-front sites and passes need lighter winds; liveaboards shelter behind the reefs overnight. September to December is usually calmest.

Tidal flow through the gaps between the Ribbons is strong on springs, so exposed pinnacles are timed for slack water. December to April brings rain, lower visibility and cyclone risk; box jellyfish and Irukandji are possible November to May.

Descend to the base of the pinnacle, circle it once while watching the blue for trevally and barracuda, then spiral upward searching the coral for nudibranchs and octopus, finishing on top for the safety stop.

Mike Ball Dive Expeditions (Spoilsport) – occasional on Ribbon Reef itineraries; historically also dived by other Cairns liveaboards.