ISS Tracks Ships At Sea

ESA’s experimental ship detector on the International Space Station has pinpointed more than 60,000 ocean-going vessels so far. It has been able to follow the routes of individual ships for months at a time.
Hosted by Europe’s Columbus research module on the International Space Station (ISS), and activated on 1 June, the tracking system picks up Automatic Identification System (AIS) signals, more usually employed by port authorities and coastguards to keep tabs on local ship traffic.
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Source: Maritime Sun News