Computer Clock Sychronisation for Connecting to Shipplotter Servers
In order to be able to share with a shipplotter server, your computer clock needs to be synchronised with an accurate clock, a time server basically. This is also true for the shipplotter server which also must be synchronised in a similar way otherwise there is no point to synchronise the clocks of the connecting clients.
If this is not done and your clock remains a significant amount of seconds off then you will be uploading and downloading no ships. It is guaranteed that a computer clock will not be able to keep accurate time without periodically connecting to a time server.