Duh, of course - what you would need is a minimum distance between ports. 
Checking if the field is already occupied might not be safe when 2 ports are 
being built at the same time, and only 1 space available for portdock for the 
second one.
-- 
https://code.launchpad.net/~widelands-dev/widelands/ship_and_portspaces/+merge/285409
Your team Widelands Developers is requested to review the proposed merge of 
lp:~widelands-dev/widelands/ship_and_portspaces into lp:widelands.

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