I am surprised how simple GPS is these days. For only £12 or so (from RS of all places, part 908-4085) I can get a small module with built in antenna that runs of 3.3V and provides serial GPS data and a very precise PPS output, is only 15mm square, and easily soldered to a PCB. It even has built in RTC that can run off a small button cell battery for fast fix and retaining time of day.
I have yet to decide on the best applications of this, apart from simple things like a speedo for a bicycle. There are applications with location logging (that dump to WiFi when back in range), or even if you just need a reliable time source for something like a door entry system (or a Brexit countdown clock, LOL).
A clock showing how long until sunset, wherever you are, would be cool :-)
I have made a module with GPS (the Adafruit module, as I found that before the RS part), and a display, so I can have a play around with it.
P.S. I have it set up for my bike, even with amount of daylight left...