When the Log Entry Is Also the Legal Record
A vessel conducting marine surveys, wildlife observation, or research operations is generating weather log entries that may become evidence in any subsequent incident investigation. When a MAIB or AMSEA review asks what the sea state was at the time of the event, the answer needs to come from a contemporaneous, timestamped record — not from the skipper's recollection three weeks later.
This template was built for that operating environment. Project name, vessel and location, date, and time establish the operational context. Everything that follows is observation data logged against that context: weather classification, visibility category, visibility distance, wind direction to sixteen compass points plus variable, wind force on the Beaufort scale from 0 to 12, swell direction, wave height in discrete increments from flat to greater than 8 meters, cloud cover in oktas from 0 to 8, glare intensity, glare direction relative to the vessel heading, and sighting conditions from very good to very poor.
The Glare Direction Field
Glare direction relative to the vessel — ahead, beam, astern, forward quarter, stern quarter, general — is the field that makes this specifically a sighting conditions log rather than a general weather record. This template is almost certainly used for marine wildlife surveys or lookout-dependent operations. The combination of Glare and Glare Direction captures why sighting conditions are degraded at a specific heading during a specific time window.
A survey vessel transiting NE at 1040 with high glare on the forward quarter and visibility rated as poor isn't conducting ineffective survey work — it's documenting the environmental conditions that explain the reduced detection rate in that transect segment. When the survey data is analyzed, the effort hours with poor sighting conditions are weighted differently from the effort hours with very good sighting conditions. That weighting requires the contemporaneous observation log.
Wave Height in Granular Increments
Seventeen wave height options: 0m, 0.3, 0.6, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, and greater than 8. Those increments match the operational significance of each threshold for a working vessel. The difference between 0.6m and 1m chop is noticeable on deck, affects station-keeping precision, and may influence the go/no-go decision for small boat deployments. The difference between 5m and 6m open-ocean swell is the difference between uncomfortable and operationally limiting for most research vessels under 40 meters.
The swell direction field, separate from wind direction, captures the cross-swell condition that produces the most uncomfortable motion — a 2m NE wind chop combined with a 3m NW swell. The log entry that records both shows the full sea state picture, not just one component.
The Beaufort scale goes to 12 — hurricane force — in the dropdown. Nobody is logging observations at Force 12 on this template, but the range is complete, which matters for an observation log that needs to be credible as a formal maritime document. A log that only goes to Force 8 is suggesting the operation was never conducted beyond that sea state, which is an implicit certification some operators would rather not make.
For a survey operation running 200 days at sea across two seasons, the weather log database shows the complete environmental envelope of the work: how many hours at each Beaufort force, what percentage of effort was conducted with poor sighting conditions, how wave height distributed across the project, and how glare affected morning versus afternoon transects. That's the effort analysis that makes the biological results interpretable.