Roaming zones allow to stay in contact with a particular talk group when moving round and the current repeater gets out of range. In this case, the radio will search for the strongest repeater in a list (the so-called roaming zone) and switch to this repeater.
Roaming Name Channels 1 "Berlin/Brand" 3,7,13,17,19,23,25,29,33,37,41,49
Therefore, a roaming zone is a simple channel list. The first column specifies the ID of the zone. This ID can be used in the digital channel table to associate a channel with a specific roaming zone. The second column specifies the name of the zone and the third column holds the comma-separated list of channel in each zone.