Name	Data Type	Definition
name	TextNameType	The textual name of the station.
type	CodeSpecialNavigationStationType	A code indicating the type of service within the chain. E.g. Master, Red Slave (DECCA), Slave (LORAN) etc..
frequency	ValFrequencyType	The value of the emission frequency.
emission	CodeRadioEmissionType	A code indicating the type of emission, as defined at the 1979 ITU World Administrative Radio Conference.

Association	Multiplicity	Role	To	Role description
belongsTo	0..1	systemChain	SpecialNavigationSystem	A special navigation system chain
isMaintainedBy	0..1	responsibleOrganisation	OrganisationAuthority	The organization responsible for the equipment.
isLocatedAt	0..1	position	ElevatedPoint	The graphical point of the special navigation station.
isOperationalBy	0..*	availability	SpecialNavigationStationStatus	The operational status of the Special Navigation Station.
hasAnnotations	0..*	annotation	Note

From	Association	Multiplicity	Role	To	Role description
EquipmentChoice		0..1	specialNavigationStation	A land based station of a special navigation system.
VerticalStructure	hosts	0..*	hostedSpecialNavStation	The Special Navigation Station hosted by the vertical structure.

1- Radio Frequency Limitation , 2 - Vertical Structure Associations , 3 - Navaid Limitation , 4 - Special Navigation System