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Might be wrong but I thought it was to stop the he'd unit looking for a different signal on regional broadcasts, hang on I'll google it......
Here we go - This is mainly used in countries where national broadcasters run "region-specific" programming such as regional opt-outs on some of their transmitters. This functionality allows the user to "lock-down" the set to their current region or let the radio tune into other region-specific programming as they move into the other region.
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