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 Pilot boats. I assume that they are pilots for the whole port of Rotterdam, not just the Hook of Holland, which just handles the same few ferries every day. UTC Time: 16:09, Tuesday 10 September 2019 Local Time: 18:09, Tuesday 10 September 2019 Estimate of longitude: 4° 7' 27.80" E = 4.124390° Estimate of latitude: 51° 58' 40.40" N = 51.977890° Possible error on position estimate: 10 metres | |