More timelapse videos:
Between sky and sea http://www.youtube.com/watch?v=lHGlWcUBqtc
Novorossiysk timelapse http://www.youtube.com/watch?v=E_9YFEiJe6A
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A handy and simple tool to determine in a minimum time what is really needed as tug assistance, is the Bollard Pull Calculator which calculates in an approximate way the total required tug power for ships in various conditions of wind and current. This tool can be loaded as an app on the smart phone.