Do I need to buy a HoloLens to use vGIS? (KB-FQ006) No. You can use vGIS on Android devices, iPhones and iPads that you have already deployed in the field. Related articles What devices does vGIS Utilities support? (KB-FQ012) Internal GPS is inaccurate. Does this mean I need to buy external GNSS for vGIS to work? (KB-FQ003) How long does a vGIS implementation take? (KB-FQ016) High-precision GNSS/RTK settings (KB-GI009) vGIS - Quick-start guide for Users (KB-QU004)