# Coastal survey brief

We will sample every **ten minutes** during the first survey.
This is a fictional example for comparing Markdown workflows.

## Before launch

- [ ] Calibrate the camera
- [ ] Confirm the launch window
- [ ] Review [the instrument note](instruments.md)

## Sampling plan

| Station | Interval | Purpose |
| --- | --- | --- |
| North | 10 min | Establish a baseline |
| South | 5 min | Watch short changes |

## Reading flow

```mermaid
flowchart LR
  A[Receive reading] --> B{Valid?}
  B -->|Yes| C[Archive]
  B -->|No| D[Calibrate]
  D --> A
```

Valid readings enter the archive; failed checks return to calibration.

## Worked mean

For three temperature readings of 18.2, 18.6 and 18.4 °C:

$$
\bar{x} = \frac{1}{n} \sum_{i=1}^{n} x_i = 18.4\ ^\circ\mathrm{C}
$$

Here $n = 3$ and $x_i$ is reading $i$ in °C.

## Review

Change a table cell, follow the instrument link, inspect the diagram
and equation, then export a PDF. Compare your actual result; this file
is not a performance benchmark or a compatibility guarantee.