Device recommendations

Hi everyone

I do grassroots football in the UK and I love to use technology and one thing I saw was a LPS system to help track players on the pitch it was very smart but way to expensive

I have traccer on my server and wanted to see if any devices exist they need to be smallish and preferably just use GPS not on a network want to keep costs down

Any advice

Thanks

For the football project, the devices should be very small. Our smallest device Mictrack MT710 (46mm x 41mm x 16mm) might be too large for your use case?