This is the distance on a river. This is the current value in the given unit. This is the speed of a target. This is the current value in the given unit. This represents a river. This is the river name. This is the river abbreviation. This represents a miles marker entry. This is the river mile or kilometer. This is the unit of the miles. This is the river. This represents a miles marker entry with a geographic position. The geographic position of this miles marker This represents a set of miles marker entry with a geographic position. A set of miles marker entries with positions. This represents a no passing zone. The mandatory unique id The optional name for identification. The begin of the no passing zone. This is always the lower mile marker. The end of the no passing zone. This is always the higher mile marker. This represents a set of no passing zones A set of NoPassingZone objects.