he buscado y encontrado algo en la rom xylon en xda:
"Unfortunately I had two issues that are pretty disruptive to my workflow:
1. GPS trackers don't calculate distances properly. Apps like maps, facebook, foursquare, etc. find my location quickly and accurately. But if I use an app like a run tracker, it vastly overestimates the distance (like 28+ miles for a 3 mile run). It's very strange, because it traces the right route (and actually when I upload the route to the web interface, the distance for the route is calculated correctly). This is not an app issue, because any GPS tracker will calcualte distance incorrectly. This is apparently an issue that plagued several ROMs, and CM found a way to fix it by reverting a performance fix (see here). Is there any chance the same issue is causing problems in Xylon? It seems like this started around the time I upgraded to build 14 stable, but I'm not 100% sure about that"
a ver si me contestan si lo consiguieron solucionar
lo curioso es, como comenta el compaņero, que he probado el sygic, y lo poco que lo he llevado iba perfectamente. Clavaba cuando llegaba a los cruces y rotondas...los que fallan son los del estilo endomondo o runtastic, no los navegadores