Found it.
Compressed Air Recreational Diving and Recreational Snorkelling Code of Practice 2005
Quote:
1.3.6 Equipment for diving
1.3.6A All divers
The employer/self-employed person
should ensure diving equipment supplied to
divers is:
(a) suitable for the type of diving being undertaken and of sufficient quality to
ensure it performs effectively for the wearer
(b) checked before diving starts to ensure it is in safe working condition
(c) cleaned and kept in good repair
(d) maintained in accordance with manufacturers’ specifications.
Oral/nasal equipment should be disinfected prior to use by another person, that is, it
does not need disinfecting if the same person is using the equipment over a period of
time.
1.3.6B Resort divers
All resort divers, other than those doing helmet diving, should wear the following
equipment:
(a) fins
(b) mask
(c) compressed air cylinder and valve designed specifically for SCUBA
(d) buoyancy control device fitted with a power inflator device
(e) regulator fitted with an alternate air source or an alternative air supply
(f) submersible depth and cylinder pressure indicators
(g) quick-release weight system
(h) exposure protection, as appropriate to conditions.
1.3.6C Entry-level certificate divers
All entry-level certificate divers should wear:
(a) all the equipment in 1.3.6B; plus
(b) snorkel (attachable or attached to the mask)
(c) submersible timing device during open water dives
(d) a knife, dive tool or shears if there is a chance of entanglement
1.3.6D Certificated divers
All certificated divers should wear:
(a) all the equipment in 1.3.6B; plus
(b) snorkel (attachable or attached to the mask)
(c) submersible timing device during open water dives
(d) a knife, dive tool or shears if there is a chance of entanglement
(e) emergency signalling equipment, including a high visibility signalling device,
for example, a safety sausage; and an audible signalling device, for example,
a whistle
(f) a lighted signalling device, for example, a glow stick, if diving is to take place
close to dusk or after dark
(g) a torch, if night diving is being undertaken.
1.3.6E Diving workers
All diving workers should wear:
(a) all the equipment in 1.3.6B; plus
(b) snorkel (attachable or attached to mask)
(c) submersible timing device
(d) a knife, dive tool or shears
(e) emergency signalling equipment, including a high visibility signalling device,
for example, a safety sausage; and an audible signalling device, for example,
a whistle
(f) a lighted signalling device, for example, a glow stick, if diving is to take place
close to dusk or after dark
(g) a torch, if night diving is being undertaken
(h) slate and writing instrument.
Notice it says
"should" as opposed to
"must", and no mention of a computer closest it gets is
"submersible timing device during open water dives"