Over 12,000 households in the Highlands and Islands have had their analogue television channels turned off permanently.
The move, which encompasses viewers in Lewis, Wester Ross, north west Sutherland and parts of Harris and Skye, is part of a year-long programme to phase in digital TV across Scotland.
Analogue BBC One, STV, Channel 4 and Five were all turned off at the Eitshal transmitter group shortly after midnight.
The switch, co-ordinated by Digital UK, is set to affect some Freeview channels also, with viewers advised to retune TVs and boxes to pick up the new frequencies.
Says John MacNeil, Digital UK assistant national manager for Scotland: “This is an historic day, as we say goodbye to the old analogue system in this part of Scotland forever.
“Viewers have responded extremely well and many are enjoying the benefits of digital TV for the first time.”