Bromfield Reef, sometimes spelled Broomfield, lies in the Capricorn Group north-east of Heron Island and is best known to divers as the shallower second dive on special trips to Sykes Reef. It offers a relaxing contrast after the deeper walls at Sykes, with delicate coral gardens at moderate depths. Local descriptions list morays, delicate coral gardens, and both pelagic and small reef fish.

The shallow reef is a good place to spend a long, easy dive after a deeper first dive, and its gardens show the range of fragile branching and plate corals that thrive on the sheltered sides of Capricorn reefs. Bromfield Reef has also featured on liveaboard itineraries from Yeppoon that tour the Capricorn Group, which suggests it offers sheltered anchorage and diving in a range of conditions. However, published detail is limited, and divers should rely on the operator's briefing for the specific area to be dived.

The reef suits all levels, including newly certified divers, and is good for photographers who enjoy coral scenes in good light. Its remoteness means it sees very few divers each year, so the reef tends to be undisturbed. Bromfield is also a reminder of how many reefs in the Capricorn Group lie beyond the reach of day-trip operators and are known only to a small number of divers and fishers.

Heron Island is 72 km north-east of Gladstone. Fly or drive to Gladstone, then take the Heron Islander ferry from the Gladstone Marina terminal (72 Bryan Jordan Drive; check-in from 7:45 am, departs 9:30 am on scheduled days, about 2 hours), or transfer by seaplane or helicopter. Dive gear is carried on the ferry in addition to baggage.

On the island, the dive centre sits beside the harbour; boats leave the jetty for three dives daily and most Heron Reef sites are 5-15 minutes away. Bromfield Reef is visited on the same special trips as Sykes Reef, roughly 40-45 minutes from Heron; MV Adori liveaboard itineraries from Yeppoon have also included it.

The Capricorn cays are exposed to the south-east trades (often 15-25 knots April-September), which make the Gladstone crossing rough and restrict diving to the lee (north-western) sides. The calmest windows are typically September-December and March-April. Northerlies in spring and summer reverse the sheltered sides.

Tidal currents run strongly around reef edges and channels on springs. Cyclone season November-April. Dived in the same calm windows as Sykes Reef; the shallow gardens are chosen on the sheltered side.

Descend onto the coral gardens at 8-10 m and meander along the reef edge, checking holes for morays and watching the blue for passing pelagics. Return shallower over the gardens for a long safety stop.

Heron Island Resort Dive Centre – occasional, as second dive on Sykes Reef trips; MV Adori (Professional Dive Services) liveaboard itineraries; private boats.