For new and even experienced flyers, always try and maintain line of sight with your craft. Yes, your Phantom could go thousands of feet up and away in the air, but honestly at even a few hundred feet away, your Phantom looks like a dot in the sky. If you lose line of sight and don’t have a strong FPV signal (that’s assuming you even have FPV), unless you remember your orientation and can bring it back to you, you may lose your craft. Play it safe, stay in line of sight of your quad.