When you start a new game and transition from Pallet town to Route 1 then to Viridian City, there will be no popup telling you what map you are in now. This is temporary and I tried to narrow it down. Defeating your rival for the second time and/or leaving Viridian City to the north towards Viridian Forest saw it start to work. It now works for all maps, including Pallet Town, Route 1, and Viridian City.
When you start a new game and transition from Pallet town to Route 1 then to Viridian City, there will be no popup telling you what map you are in now. This is temporary and I tried to narrow it down. Defeating your rival for the second time and/or leaving Viridian City to the north towards Viridian Forest saw it start to work. It now works for all maps, including Pallet Town, Route 1, and Viridian City.