The imagery, and nothing else. Four charts, camera square, height as recorded, raw files retained, three frames per point with the charts re-seated between.
This is a full dive's work on its own, which is why the census is not on it. Four objects to place on a reef is four chances to touch something you should not, and a diver concentrating on chart geometry stops watching their fins.
Quick check
Three questions, drawn at random from this lesson's set, one attempt each. The right answer is shown either way. Two of three opens the next lesson; fewer and you get another three. Nothing is recorded anywhere but this browser, and this is not the Knowledge Review — it is a way of showing the lesson was read.
Generated from the Reef Chronicler Student Handbook, version 0.04. The course documents are the authority; if these pages and they ever disagree, the documents are right.