Has the easySPLIT always to be switched on (under power), so that the functionality of the VHF-device (transmit – receive) will be guaranteed?

Your question means the situation like anchoring in a port, coastal shipping without navy shipping etc. where the operation of the AIS receiver is not necessary or is senseless. As in the port, if you want to listen to the weather report on VHF. Your question is also legitimate. The „way/path“ VHF antenna – radio transceiver is security relevant. Because of that the „way/path“ is always connect through, that means you can always listen to the VHF radio and also transmit with the VHF radio, even though the easySplit 2nd G. is not connected with the power supply of the boat or is not switched on.