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This will check if a coordinate is valid.
If using degrees / radians / grads there are natural limits for valid values (-180 to 180, -90 to 90 etc).
For all coordinate units the coordinatewindow is used for checking that P is within a certain bounding box of the street network.
By setting CoordinateWindow < 0, this part of check is disabled.
Syntax: CheckCoordinate(P: TFloatPoint)