A:AnswerThere is NO memory card included. You must buy an SD memory card. The manual recommends class 10 speed memory cards for movies. Slower cards will probably work for still pictures.
A:AnswerYes you can transfer from camera GH4 to PC with USB cable. I prefer to use a Card Reader on the PC because this is much faster. I have a USB 3.0 reader that is very fast. but either way will work.
A:AnswerThis is not designed to be a waterproof or water resistant camera. If that's what you plan on doing then you'd be better off to spend more money and get an actual waterproof camera like the Canon Powershot D30. I have it and use it for snorkeling and scuba diving. It is safe down to 82 feet and takes great pictures.