I have the following stored on Deer Stalking folder on mine:
Winchester Ballistics App - as I use their ammo
IGamebook App - to record all my outings - includes date, location, map where I plot the location of my outing, individual or group, total shots fired, number, sex and type of animal, a photo can be attached and a descriptive section. It can be used for deer, vermin and game shooting. It has a list of the seasons on it. Spits out statistics showing how many outing of each type you have done each year and total of each type and sex of animal that you have bagged.
I have various weather apps - met office, bbc, accuweather
Darkness app - which tells you the times of sunrise and sunset
I also have numerous web links saved in it such SD, Best Practise Manual, BASC, BDS, etc
ATB
Stewarty