Study the BSAC Advanced Instructor syllabus as a system of roles and decisions rather than a list of topics. Map every diver grade and instructor grade against what that person may legally and safely do, practise separating dive-manager, marshal, instructor and buddy responsibilities in written club scenarios, and rehearse explaining decompression and site choices in plain teaching language. Check readiness by teaching a topic aloud to a timer and scoring yourself against a rubric, not by rereading notes.
Map the BSAC diver grades before you teach them
BSAC's recreational ladder runs Ocean Diver, Sports Diver, Dive Leader and Advanced Diver, and each grade widens what a diver may do and under whose supervision. An Advanced Instructor must explain those boundaries precisely.
Build a one-page map showing, for each grade, three columns: depth and gas expectations, the conditions a diver may enter, and who supervises them. Ocean Diver sits at the sheltered, supervised end; Sports Diver expands conditions and introduces more decompression and gas options; Dive Leader adds responsibility for others; Advanced Diver operates across a broader range of sites and roles. When you can state each boundary in one sentence, you can teach it.
The reason this map matters for instructing is that every open-water teaching decision depends on the trainee's grade. A scenario that is suitable supervised practice for one grade may be an unsupervised dive for another. Practise by taking five hypothetical trainees at different grades and writing one sentence per person describing what they may do on the same site and tide. If two sentences blur together, revisit the grade definitions rather than the site plan.
- Ocean Diver: entry-level, supervised, sheltered conditions
- Sports Diver: progressively wider conditions and gas choices
- Dive Leader: trained to take responsibility for dive organisation and others in the water
- Advanced Diver: broad experience across varied sites and roles
Separate the instructor grades and what Advanced Instructor adds
BSAC's instructor pathway starts with the Instructor Foundation Course and then layers instructional responsibility through theory teaching, open-water instruction and advanced instruction. Know exactly which duties each grade carries.
The pathway is easiest to learn as a sequence of added duties rather than a list of certificates. The Instructor Foundation Course introduces instructional technique; subsequent theory-instructor level work covers classroom teaching; open-water instructor level covers teaching in the sea or inland sites; Advanced Instructor is the level at which instruction, dive organisation and mentoring of other instructors come together. Compare each grade by asking one question: what can this person do without a more senior instructor present?
A useful study drill is to write three short teaching briefs: one a pool or sheltered-water theory session, one an open-water skill lesson, one a club dive organised and led by you. For each, note which instructor grade could run it unsupervised. This exercise exposes the difference between Advanced Diver, which is about the diver's own capability, and Advanced Instructor, which is about enabling others. Confusing those two credentials is a conceptual error worth correcting early, before it contaminates your scenario answers.
| Credential | Focus | Key question to distinguish it |
|---|---|---|
| Advanced Diver | Personal diving capability across varied sites and roles | What can this diver do themselves? |
| Advanced Instructor | Teaching, organising and developing other divers and instructors | What can this person enable others to do safely? |
| Theory-level instructing | Classroom and knowledge teaching | Can they deliver knowledge sessions without supervision? |
| Open-water instructing | Teaching skills in open water | Can they run open-water lessons without supervision? |
Dive manager, marshal, instructor, buddy: whose call is it?
BSAC club diving separates the jobs of managing the dive event, marshalling individual pairs and diving as a buddy team. Advanced Instructor-level decisions depend on naming who owns each decision.
Draw a responsibility grid for a branch dive day. The dive manager owns the overall plan: site selection, conditions assessment, who dives which pair, and the abort criteria. The marshal or dive leader on the water owns cover arrangements, logging pairs in and out, and surface cover readiness. The instructor owns the training objectives for their pair. The buddy pair owns depth, time and gas discipline within the plan. Write one decision per row so nothing is jointly owned by default.
The learning point is that ambiguity, not ignorance, causes weak answers. When a scenario says 'the most experienced diver will keep an eye on things', a trained response replaces that vagueness with named roles and a named decision-maker. Practise rewriting five loose club-dive descriptions into role grids. Each rewrite should end with a single sentence naming who aborts the dive and on what trigger. If you cannot name that person instantly, the grid is not finished.
Worked scenario: a club reef dive with a weather window
A scenario about a short weather window tests whether you can restructure a dive day by changing roles and objectives instead of pressing on with the original plan.
Scenario: a branch plans a two-wave reef dive on Saturday. Friday's forecast brings the wind round earlier than expected, shortening the usable window. The dive manager also notes that one planned pair includes a newly qualified Ocean Diver. The plausible mistake is to keep the original site and pairs and simply 'start earlier and stay shallower'. That decision quietly changes exposure to tide and surface conditions while leaving supervision unchanged, and it moves the abort decision from the plan into improvisation on the day.
The better decision restructures deliberately. The dive manager moves the dive to a more sheltered alternative site, pairs the newer diver with an instructor whose objective is a training dive rather than a scenic dive, and sets an explicit turnaround time and sea-state abort criterion for the whole event. This matters because it demonstrates the chain the qualification is built on: conditions assessment feeds site choice, site choice feeds pairing, pairing feeds objectives, and objectives feed abort criteria. Rehearse that chain aloud until it is your default response to any changed scenario.
Teaching in UK conditions: cold, visibility and tide
Instructing in UK water means planning for reduced visibility, cold affecting skill performance, and tidal timing. Teach the adaptation explicitly rather than treating conditions as background noise.
For each skill you might teach, write the UK-specific adaptations. Mask clearance and buoyancy drills become harder when a silted bottom cuts visibility, so the lesson plan needs a lost-buddy and lost-trainee procedure agreed before entering the water. Cold shortens useful skill practice, so brief skills on the surface thoroughly and use in-water time for performance, not explanation. Tidal streams decide the dive window and the entry and exit points, and both belong in the trainee's pre-dive brief, not just the manager's plan.
Worked scenario: an instructor plans to teach a mid-water buoyancy skill on an estuary wreck. The plausible mistake is scheduling the lesson at the same slack window as the club's general dive, so the trainee is surrounded by other pairs while concentration is demanded. The better decision is to run the teaching dive as its own wave, in water chosen for teaching quality rather than scenic value, with the marshal briefed that this pair has priority on space and surface cover. The teaching point: a training dive has different success criteria from a club dive, and mixing the two dilutes both.
Decompression concepts you must explain, not just follow
At this level you should be able to explain no-stop limits, decompression obligation, gas planning and the role of dive computers and tables as tools with limits, in teaching language.
Structure your understanding as teachable contrasts. No-stop diving versus decompression diving: one permits direct ascent, the other commits the diver to planned stops. Tables versus computers: tables teach the model and force deliberate planning; computers track an individual profile and need conservative settings and clear no-decompression-limit awareness. Gas planning then follows from the profile: reserve calculation, turn pressures and what happens if a pair separates. BSAC also offers dedicated training in accelerated decompression procedures, which shows how decompression thinking extends beyond basic no-stop diving.
Practise by writing a five-minute explanation of why a deep, short dive and a shallow, long dive can produce the same decompression concern. If you can only recite limits, you are not yet teaching. Then add the instructing layer: at which point in a lesson would you introduce each concept, and what demonstration or question checks understanding? An Advanced Instructor-level answer explains the model, its assumptions and its failure modes in plain English, and knows when a trainee should move from computer trust to table reasoning.
A teach-back exercise, rubric and adaptable preparation sequence
Test yourself by teaching short topics aloud to a timer and scoring the performances against a rubric, then follow a sequence that moves from grade mapping to full scenario decisions.
Exercise: pick three topics, such as lost-buddy procedure, gas reserve logic and slack-water planning. For each, prepare for five minutes, then teach aloud to a timer for five minutes without notes, as if to a mixed-grade club audience. Record yourself. Score each performance on the rubric below, aiming to improve your weakest criterion before re-recording. Expect your first attempts to reveal filler, ordering problems and missing abort criteria; those observations are the exercise's real output.
A adaptable preparation sequence: week one, build the grade and role maps from sections one to three and rewrite five loose dive descriptions into role grids. Week two, drill the conditions and decompression explanations from sections five and six, one topic per session. Week three, run the full scenario chain from section four on three fresh scenarios, writing decisions and abort criteria. Week four, repeat the teach-back exercise and re-score. Note that current course requirements, prerequisites and assessment arrangements change, so confirm administrative details with BSAC directly at bsac.com rather than relying on older notes.
- Rubric criterion 1 - Accuracy: every grade, role and limit stated matches the BSAC framework
- Rubric criterion 2 - Role clarity: the explanation names who owns each decision
- Rubric criterion 3 - Adaptation: UK conditions or trainee grade change the plan visibly
- Rubric criterion 4 - Abort logic: a named person and trigger end the dive
- Rubric criterion 5 - Teaching quality: plain language, one example, a comprehension check
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.