Structure of a caster entry in sourcetable.

Count	Element	Description	Content
1	type	Indicator of a caster description	Content: CAS
2	host	Caster Internet address	host name or IP address
3	port	Port number	numeric port number
4	identifier	Caster Identifier - Name of Caster or Caster provider	Text
5	operator	Name of institution or company operating the caster	Text
6	nmea	Caster accepts NMEA input (1) or not (0)	Content: 1 or 0
7	country	ISO 3166 country code	3 characters
8	latitude	Position, Latitude in degree	decimal number, two digits after dot
9	longitude	Position, Longitude in degree	decimal number, two digits after dot
10	misc	Miscellaneous information	Text