Use cases
Flagged early. Confirmed independently.
Each case is checked against an outcome recorded by someone else. Pick one.
Flagged 60 days before the notice.
A shoal on the Hooghly lost a metre of depth. PortEye flagged its reach on the first satellite pass, two months before the official hazard notice.
Case 01 · PortEye · Hooghly corridor
What happened
This shoal lost a full metre of depth. The first public record of it was a hazard notice to shipping, issued once the change had already happened.
Published by an independent global shipping agency as a notice to vessel operators.
Read the notice →3.2m
before
2.2m
after
−1.0m
depth lost
What we did
We watched twenty points along the corridor on every satellite pass, comparing each one against its own past behaviour. The reach containing this shoal was flagged from our first observation, and stayed flagged.
60
days between our first flag on this reach and the published notice.
11/11
satellite passes on which this reach was flagged.
20
places watched along the corridor throughout.
Each point is scored against its own past behaviour, not against a fixed number borrowed from elsewhere. A score only counts once it holds across consecutive passes.
Interpreting the scores
Phalta and Falta Bar are two adjacent points on the same reach, a short distance apart.
The surface signal peaked in mid-May and then settled, weeks before the depth loss was formally written down. The signal precedes the paperwork, which is the whole point.
What satellites can cost-effectively do that vessels can't
Satellite observation is a proxy for change at the water surface. What it can do, and what a survey vessel cannot, is watch every point every few days, for months at a time, so the survey goes where it is needed.
More cases are added here once their outcome is independently confirmed.