Yes, it should synch. Check that it is set to LON as home timezone. (Hold top left button down until 3 letter city code is flashing in upper right of display, use the buttons on the right to cycle it until is shows LON if it didn't already.) I had to do that with my wife's G (not a 5000) when it had been completely out of charge, they seem to need to know they're in the right zone to listen for the radio signal, as they seem to default to TYO (Tokyo) and are therefore listening for the Japanese signal.