GPS on and barometer engaged for that matter will use more power in windy conditions. Not only is the copter moving forward, it is fighting to hold position and altitude. In full manual mode the wind will move the copter but the motors won't be constantly adjusting to hold horizontal/vertical position.
Learn what the sweet spot is for current draw and use that speed to attain maximum efficiency. Hovering actually uses more than moving at slow speeds. The law of diminishing returns will overcome at some point, so knowing your machine's flight characteristics is important.
Learn what the sweet spot is for current draw and use that speed to attain maximum efficiency. Hovering actually uses more than moving at slow speeds. The law of diminishing returns will overcome at some point, so knowing your machine's flight characteristics is important.