It has the basic information(if provided) about lodging that you'll find along the Camino de Santiago.
You'll find address, phone, hours, price and some extra information, such as if they have washing machine, garage for bicycles or kitchen for cooking your own food...
I coded it to avoid the use of internet data on the phone, most of the times there is no signal or very bad reception.
You can also use the GPS to find the selected hostel on the map,
You can also check the distances between locations and get an idea of the distance to the next town.
Lodging info changes almost every year, please take it as an approximate information. I try to keep it as current as possible, since I also use it and I hate having bad information ;)