Sorry Blueandwhite I sit on a Local Airspace Infringement Team and the number of people infringing (and by implication not where they thought they were) is on the increase. I use my iPad and Skydemon in the main but always keep a half mil open in case the iPad expires [like it did once in Florida until I scrabbled about and got the powerbank hooked up.] I also keep the important frequencies on my kneepad.
Agree with CFO there is an element of satisfaction when it all (surprisingly) works out.