Hello,
do you use smartphone apps (Android) for collecting field data?
Up to now I used following:
Orux - for preparing offline maps from WMS as mbtiles,
Locus Map - for collecting data and georeferenced photos,
FieldMove Clino - for collecting geological data,
Mobile Topographer Free for work in local CRS and WGS conversion,
GPS Status PRO - for sensors calibration and handling A-GPS data.
The best experience I have with Locus.
Do you use anything else?