OS1
OS1 – Being Underwater
- SEEDS brief
- Fit and use mask, fins and snorkel – in standing depth
- Enter into shallow water, without equipment
- Demist mask
- Fit mask
- Secure snorkel
- Breathe through snorkel, face submerged, static
- Flood/clear snorkel by exhaling, static
- Fit fins
- Practise finning on back
- Practise finning on front
- Flood/clear snorkel, face submerged, while finning
- Remove fins
- If needed, exit water
- Fit and use scuba – in standing depth
- Fit weight belt
- Fit scuba equipment
- Quick but thorough buddy check
- Refit mask
- If needed, enter into shallow water, wearing scuba kit
- Breathe from demand valve, standing depth
- Use hand signals
- Fit fins, standing depth
- Buoyancy control – in standing depth
- Demonstrate BC controls, on the surface
- Swim on back with BC inflated, on the surface
- Swim on front with BC inflated, on the surface
- Monitor instruments
- Descend and adjust for neutral buoyancy, kneeling
- Adjust buoyancy lying flat
- Hover clear of bottom
- Check trim
- Swim at constant depth, develop finning action
- Swimming underwater – in deeper water
- Buoyancy adjustment with changing depth
- Use hand signals
- Practise swimming underwater
- Remove scuba – in standing depth
- Remove fins
- Remove weight belt
- Remove scuba kit
- Exit water
- Equipment care
- REAP debrief
OS2
OS2 – Basic Skills
- SEEDS brief
- Kit assembly
- Kit up and buddy check, dry run and entry
- Fit weight belt
- Fit scuba equipment
- Buddy check
- Dry run, demand valve clear by exhaling
- Dry run, demand valve clear with purge button
- Fit mask and regulator
- Entry
- Fit fins, standing depth
- Surface and underwater swimming, buoyancy control
- Swim on back with BC inflated, on the surface
- Swim on front with BC inflated, on the surface
- Buoyancy check, standing depth
- Swim underwater to deeper water
- Consolidate underwater use of BC controls, deeper water
- Mini ascent/descent, deeper water
- Ascend to surface, deeper water
- Descend to bottom, deeper water
- Swim underwater to standing depth
- Mask and demand-valve clearing – in standing depth
- Breathing without mask, nose submerged
- Mask clearing, face partially submerged (no strap fitted)
- Mask clearing, face submerged (no strap fitted)
- Mask clearing, standing depth (no strap fitted)
- Partial-flood mask clearing, standing depth (strap fitted)
- Progressive-flood mask clearing, standing depth (strap fitted)
- Full-flood mask clearing, standing depth (strap fitted)
- Demand valve clearing by exhaling
- Demand valve clearing with purge button
- Switch to own AS demand valve
- Demand-valve retrieval
- Demand-valve retrieval and switch
- Full demand-valve retrieval and clear
- Use of alternative supply – in standing depth
- Underwater use of ‘out of gas’ signal
- Use of AS, student as donor
- Use of AS, student as recipient
- Exit and de-kit
- Remove fins
- Exit water
- De-kit
- Equipment care
- REAP debrief
OS3
OS3 – Developing Skills
- SEEDS brief
- Kit up and buddy check, dry run and entry
- Assemble scuba equipment
- Carry out functionality checks
- Kit up and buddy check
- Dry run, action for BC inflator stuck open
- Stride entry, into deeper water
- Buoyancy control and descent/ascent procedures
- Demand valve and snorkel exchanges while surface swimming
- Controlled descent into deeper water
- Efficient underwater swimming (changing depth)
- BC inflator stuck open
- Mid-water hover
- Controlled ascent and surfacing procedure
- Mask clearing – in deeper water
- Partial-flood mask clearing, standing depth
- Full-flood mask clearing, standing depth
- Remove and replace mask, standing depth
- Breathing from a free-flowing regulator, standing depth
- Recap mask clearing, in deeper water
- Partial-flood mask clearing, deeper water
- Full-flood mask clearing, deeper water
- Remove and replace mask, in deeper water
- Alternative-supply ascents – in deeper water
- Static AS use, student as donor then recipient
- AS ascent, student as recipient then donor
- Surface actions, following AS ascent
- Exit from deeper water and de-kit
- Remove fins
- Exit water
- De-kit
- Equipment care
- REAP debrief
OS4
OS4 – Beyond the basics
- SEEDS brief
- Kit up and buddy check, backward-roll entry
- Assemble scuba equipment
- Carry out functionality checks
- Kit up and buddy check
- Backward-roll entry, into deeper water
- Master basic skills
- Controlled descent into deeper water
- Adjust for neutral buoyancy
- Buddy-diving techniques and monitor instruments
- Efficient underwater swimming (changing depth)
- Remove and replace mask, in deeper water
- Remove and replace mask, place it down
- Finning without mask
- Extend mobility skills
- Surface snorkel swim in scuba kit
- Controlled descent into deeper water
- Frog kick
- Forward rolls in deeper water
- Ascent in buddy pairs from deeper water
- De-kit, in water, exit suitable for small boat
- Swim to ‘boat’
- Remove weights in water
- Remove scuba in water
- Enter boat
- Equipment care
- REAP debrief
OS5
OS5 – Safety Skills
- SEEDS brief
- Kit-up and buddy check, dry run, forward-roll entry
- Assemble scuba equipment
- Carry out functionality checks
- Kit up and buddy check
- Dry run, controlled buoyant lift
- Forward-roll entry, into deeper water
- Master alternative-supply skills
- Surface actions, following AS ascent
- AS ascent, student as recipient then donor, with surface actions
- Use of AS on horizontal swim
- Controlled buoyant lift
- Self lift
- Mini CBL
- Full CBL
- Surface towing
- Identify towing hold
- Tow
- Alternative holds
- Rescue with controlled buoyant lift
- Surface actions
- Initial underwater contact
- Rescue CBL
- Rescue CBL and surface tow
- Exit from deeper water and de-kit
- Remove fins
- Exit water
- De-kit
- Equipment care
- REAP debrief