Modelling of ocean currents/drift

[HEMISENT]

Last night I completed a mission. Pulled into Wilhelmshaven about 0100 in heavy rain/high winds/horrible visibility. I always dock at the pier or in sub pen. to avoid a collision in the dark I pulled the boat next to a high seawall, shut everything down, came to full stop. I hit x64 time compression and watched on map view closeup as my boat moved back out away from seawall and about 300m closer to dock area. By daylight I was back in the middle of the channel much closer to the piers.