F45 is the airport where Cloud9 Helicopters is based. This flight wouldn’t have gone there though. I believe it was stated that they were headed to Ft Lauderdale, where they could have cleared customs.
On a separate note...
... they drilled a perfectly good aircraft into the water two miles from departure.
Has it been established that this was a perfectly good aircraft?
Looking at the images, does the damage on the port side (door track and skin pushed inboard, gear sponson cover torn off) fit the CFIT story? Or does it suggest some sort of loss of control with a significant sideward velocity component at impact?