"Satellites used for measurement (Exif:Gps satellites)" is a predefined property of type Text. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
Y
11,5,80,70,16,10,47,128,26,2,43,116,17,29,42,227,25,30,40,283,18,12,33,329,16,26,10,27,0,4,9,102,16,15,6,12,0,21,4,272,0,13,1,153,0 +