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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?

Emka
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  • Does your software calculate the shortest distance independent of weather, sea state, and shipping route regulations - such as Traffic Separation Schemes? – daniel.heydebreck Dec 13 '17 at 09:31
  • @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? – Emka Dec 13 '17 at 10:46
  • 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? – daniel.heydebreck Dec 13 '17 at 12:14
  • 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. – daniel.heydebreck Dec 13 '17 at 12:17
  • @daniel.neumann Weather is not yet integrated, and SECA and piracy are parameters that remain constant to me. – Emka Dec 13 '17 at 12:24
  • Are the map projections the same? Would tides come into play? – Inkenbrandt Dec 13 '17 at 13:59
  • If TSSs are included, is it possible that the 2000nm was in one direction and the 2003 in the other? Using the other lane approaching a port could easily add a few miles. – Semidiurnal Simon Dec 16 '17 at 00:27
  • @Inkenbrandt I am afraid I do not have any information about projections and tides are not considerate into the calculations. – Emka Dec 18 '17 at 07:49
  • @Flyto I believe the same as you, but I cannot find any working example. Because whatever I have tried they return the same result regardless direction. – Emka Dec 18 '17 at 07:51
  • Could be a setting to follow either great circle or thumb line (constant heading), which would be a bit longer. – Ben51 Jan 18 '18 at 02:16

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