Great news for people standing in the rain doing fieldwork - the EU constellation of positioning satellites (Galielo) are now offering initial services which adds to the existing GNSS constellations like GPS and GLONASS, etc. More satellites means better accuracy (no more 'poor PDOP' - an in-joke if you've ever used a Trimble rover), less chance of dropping below the minimum required to calculate 3D position and faster initialisation times too so you can get out of the rain even sooner. With eighteen satellites in orbit now they need 24 for the full constellation (2 failed in launch on a Soyuz rocket early in 2016) and will be adding to functionality over the coming years.
Anyone interested in more detail on GNSS satellite orbits - I recommend this neat webpage - stuff in space. If you search for Sentinel 2a, Meteosat and Galileo you will see examples of three main orbits, polar (low earth orbit), geostationary and the one that Galileo is in, a medium earth orbit.