GoPro 3+ and 4 cameras conserve battery life by displaying a reduced resolution preview when you're viewing a live feed but not recording. Once you start recording, the live feed resolution increases dramatically. So if you are only using the live feed function for observation, and don't necessarily need to record, you might still find it useful to put the camera in loop mode, and hit record. That way, you'll never fill up your memory card, and you'll still get the high resolution live feed.
..................
This is our weekly series of technical tips to help you get the most out of your underwater gear.