"Doc Martin" is broadcast on PBS and many of its local affiliates, so viewers can verify whether or not their station airs the show through a provider screen on the PBS website. While streaming devices can make "Doc Martin" and other shows easier to watch, they are never absolutely required.
Streaming devices can be used to view some PBS shows on demand. This lets viewers pick and choose when and where they want to catch up on their favorite programs.
The PBS website offers a programming calendar for local affiliates. This makes it easy to determine whether or not "Doc Martin" airs in a given area and, if so, when it airs.