Some of the most common reasons for receiving no data/empty responses from your API calls are:
No record in the MarineTraffic database during the defined timespan
- You can try to alter the timespan (be careful not to exceed the upper timespan limit of each API call).
No terrestrial coverage in the area
- The vessel(s) sails in an area with limited coverage from terrestrial AIS-receiving Stations. Consider upgrading your service to also include satellite coverage.
The actions mentioned are applicable to the following API Services:
PS02 - Vessel Positions
PS03 - Vessel Positions of a MarineTraffic Fleet
PS04 - Vessel Positions within a Port
PS05 - Vessel Positions in a Predefined Area
PS06 - Vessel Positions in a Custom Area
PS07 - Single Vessel Positions
EV01 - Port Calls
VI01 - Voyage Forecasts
VI02 - Expected Arrivals