The reality TV darling and husband Jason Hoppy took a sailboat from Block Island to Nantucket Saturday for an 8-hour tour but the boat’s GPS malfunctioned and the boat went off course for 20 hours.

Frankel explains: “The captain had to call the Coast Guard and we were hit by a big wave. It was very scary. It was traumatic. Absolutely traumatic.”

“It was so scary. I was thinking, Oh, my God, Bryn! I’m not going to be there at six o’clock in the morning when she wakes up and she’s going to wonder where Mommy is and gosh, if something were to happen to me, what would happen to her. I was having horrendous thoughts.”

Glad everyone on boat is safe. Frankel said, whose new E! True Hollywood Story premieres on Wednesday at 10 p.m.