You get the benefits of offline use as you download FATMAP maps straight to your device. At the moment, the maps can be up to a GB in size and some devices might be near capacity when the download starts.
Luckily there are many ways of clearing out space whilst preserving your photos, podcasts and other media.
Here are a few articles that will help you free up space:
Using our new streaming function will allow you access to the same maps without using nearly as much storage, just be careful as streaming will only work when you have access to a cellular network while skiing.