[
{"codes":[0],"description":"unknown"},
{"codes":[1],"description":"logbook (paper)"},
{"codes":[2],"description":"national telecommunication channels"},
{"codes":[3],"description":"national publications"},
{"codes":[4],"description":"logbook (electronic)"},
{"codes":[5],"description":"global telecommunication channels (GTS)"},
{"codes":[6],"description":"international publications"}
]