Layer Estimates:

Layer: GPS_Stations (ID:0)
Count: 391
Extent:

XMin: -13832027.2213545
YMin: 3848842.56608262
XMax: -12757148.8298036
YMax: 5132125.79782712
Spatial Reference: 102100 (3857)

Layer: GPS_Data (ID:1)
Count: 2248724