PuntoGPS
Minimalistic wide-open GPS-locator/tracker
..., allowing others to find them.
It runs on any browser and supports a great variety of tile layers (Open Street Map and Google Satellite among others).
As a php+mysql service can be installed on any web server (i.e. your bike-team site!).
It's free, open source, portable and cross-platform.
*** NB ***
- Check the "allow unknown sources" option on your device security settings to setup on Android.
Current version: 0.9 (beta)
Release notes: -> https://sourceforge.net/p/puntogps/blog/