One thing I recommend is to make sure the drone camera is oriented away from you when landing. I've seen too many folks crash their drones by accident, pressing the control stick in the wrong direction.
I've flown the Karma on several occasions without GPS. In fact...one of the first times (Second time I flew it)... I Just bypassed the GPS connection because I was a noob and didn't realize how important it was. I was trying to get a quick shot of my hotel balcony and was surrounded by tall buildings with wifi interference and a pretty obscured view of the sky. The drone was drifting only slightly as there was a limited breeze due to the protection of the building. I honestly didn't know any better.. I thought that was just how the drone was. I almost hit a tree... The drone was brand new to me...so I really didn't know any better...fortunately...it was a quick photo shoot, and I was able to land without further incident.
Later (third time), I tried taking off from a beach that was incredibly breezy and I almost hit another tree... fortunately, I avoided the sand and the tree only by sticking a very rough landing on some grass nearby. One of my props flew off and landed more than 100 feet away near a pool area...things could have been so much worse! I thought I had done my homework... I did more digging to try and figure out what I was doing wrong... and eventually figured out just how important the GPS connection is...and what horrible locations I was choosing to fly. I later went down to the same beach armed with new knowledge, and it was like a night and day difference flying the drone.
One of the other times I lost GPS, I was on a short dock and had limited connectivity. I launched the drone, and almost immediately lost GPS. It was windy and the drone was drifting all over the place, and very hard to control. I only had about a three foot section to set it down... I was pretty nervous. The drone eventually regained GPS connection while still in the air and I was able to fly it and land it without further incident.