Date and time for a new LAST position

[routeconverter]

Does this explanation make what I did clear?

Yes, and I'm concluding from it that calculating the time at the moment of the inserting relies on the inserted position to be a the right coordinates. RouteConverter inserts new positions in the center of the map - and this is not always what one would expect. There is not eastbound or westbound or any other logic that tries to deduct the new position from the previous ones.