Meet the site
Jack's Patch is a lesser-known south-coast reef that rewards divers with their own boat. Marinelife.org.au describes it as a north-south strip of limestone reef with hard and soft corals, swim-throughs and ledges, and one large cave at its northern end. The shallowest point is about 13 m, most of the reef is at 15-17 m, and the southern and western sections drop deeper, to about 27 m.
The coral cover reflects the influence of the Leeuwin Current along Rottnest's south coast, and the ledges and swim-throughs provide good macro photography, according to the guide. It also notes that there is limited crayfish habitat, so this is a dive for reef scenery and small life rather than lobster. Expect buffalo bream, western king wrasse, bullseyes, morwong and sweep, with the chance of larger fish in the deeper sections.
The site's appeal is its combination of moderate depth, reef structure and relative obscurity: it is not a standard charter site, so it tends to be unspoilt. The trade-off is that it is exposed to the south-west and is best on a calm day with excellent visibility. It suits Advanced divers or experienced Open Water divers who can manage 15-20 m on air and navigate a linear reef. Pair it with the shallow Parker Point drop-off or Salmon Bay reef for a second dive.
As with other boat-only reefs on the south coast, carry a DSMB, fly a flag and keep someone on the boat in case the anchor drags in the afternoon sea breeze.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Jack's Patch is recorded as Reef in Rottnest Island. The listed access is boat (day trip). Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Other water users
- Ask about vessel activity, exclusion areas and the agreed surface arrangements.
- Planned depth
- Confirm the intended route and training requirements; the recorded maximum is not a target.
- Water movement
- Ask how swell and local exposure affect the proposed entry, exit and route.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Jack's Patch suitable for my certification?
The record lists Advanced Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Jack's Patch through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Hard and soft corals, buffalo bream, western king wrasse, bullseyes, morwong, sweep, nudibranchs and macro life
Location
North-south strip of limestone reef with hard and soft corals, swim-throughs, ledges and a large northern cave, about half a mile south-west of Salmon Point on the south coast.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
marinelife.org.auRecord updated 26 Sept 2026. Source claims are being reviewed.