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Re:Vessel Finder by pella on Tuesday July 14, 2020 @04:54AM (#23829826)
openseamap view ( OpenStreetMap + Marine Traffic ) :

http://map.openseamap.org/?zoom=9&lat=35.98913&lon=-5.41849&...

Re:Vessel Finder by 082349872349872 on Tuesday July 14, 2020 @05:12AM (#23829915)
The two-layer feature of the Strait of Gibraltar:

https://books.google.ch/books?id=nUtLDwAAQBAJ&pg=PA46&lpg=PA...

meant that submarines used to be able to pass in both directions with engines off.

Still physically possible, but no longer worthwhile: https://news.ycombinator.com/item?id=23548220

Re:Vessel Finder by mrweasel on Tuesday July 14, 2020 @05:07AM (#23829888)
There is also: https://skibstrafik.dk/ which is pretty good. You can even get a picture (if available) and more information about a ship by clicking on it.
Re:Vessel Finder by sails on Tuesday July 14, 2020 @06:44AM (#23830397)
Any more info on this? I once had a go at finding an open API for AIS data and really struggled.