Is there an app for “GPS” on a mobile device?

thousands.

what do you actually want it to do?

Just track my journeys, tell/record where I am with elevation measurements linked to Google maps I guess. Just got 4g. Trying “Geo Maps” at the mo’.

Prompted by severe lack of accurate paper mapping in my location (Spain) and also because I might as well climb on board with the tech by now… 🙄

backcountry navigator has a lot of fans. don’t know much about it myself.

We used back country navigator to do the bernia ridge in Costa blanca last year. It had full Spain IGN topo mapping down to 1:25k there used to be a 30 day free trial app as well so you could try it out.
Also, you don’t need 4g, just download the area of map you want onto your phone beforehand.

for normal GPS duties.. viewranger

for cycling/running specific GPS tracking duties Strava

for finding bike trails when out, Trailforks

This was a screen shot of the spain IGN topo, looks like it might actually be 1:50k scale rather than what I stated above (you can zoom in at that scale tho).