Can I run other apps while I have Arccos open?
Yes. You can run other apps, text, email, and take phone calls while Arccos is running (though it's really bad etiquette to take a phone call on the golf course). Keep in mind though that the more you use your phone for other tasks and the more apps you have running the faster your battery will drain. Arccos can consume about 60% of your phone's charge during an 18 hole round, so heavy phone use during an Arccos round can exhaust your battery.