Hello,
I have used my gps cycle computer a few times. There's no set up turn it on and go, it's quite interesting. Mine gives max and average speed etc. If I had bothered to upload it it would plot my course on a map. Having said that the course it showed me on the display was just a huge squiggle.
I use a basic garmin it cost about £80 a few years ago. I suspect there are cheaper versions around now.
Regards
Paul