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I am working on a shipping company and we have several applications to calculate the distance between two ports. My curiosity was triggered by the fact that, time by time I see a small change on the distance. For example, when the distance was 2000 miles it changed to 2003 miles.

I searched if there was any infrastructure changes on the port but my search came back negative.

How could this addition on miles be explained?

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  • $\begingroup$ Does your software calculate the shortest distance independent of weather, sea state, and shipping route regulations - such as Traffic Separation Schemes? $\endgroup$ – daniel.neumann Dec 13 '17 at 9:31
  • $\begingroup$ @daniel.neumann The software I am using is Netpas. As far as I understand it does not use any of the above. Only shipping route regulations should be used but why a route could be altered? $\endgroup$ – Emmanouil Karamalegos Dec 13 '17 at 10:46
  • $\begingroup$ It might be due to changes in the marine spatial planning in the coastal waters (wind turbine farms, military restricted areas, environmental protection areas, for other reasons blocked areas). Or are there maybe tides included in the routing software? $\endgroup$ – daniel.neumann Dec 13 '17 at 12:14
  • $\begingroup$ According to the Netpas webpage it provides "distance data with (S)ECA, Weather Forecast, Piracy Alert and many other powerful functions". It sounds reasonable that you get slightly varying distances. $\endgroup$ – daniel.neumann Dec 13 '17 at 12:17
  • $\begingroup$ @daniel.neumann Weather is not yet integrated, and SECA and piracy are parameters that remain constant to me. $\endgroup$ – Emmanouil Karamalegos Dec 13 '17 at 12:24

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