The couple were aboard the Carnival Fantasy ship in October last year. File photo / Getty Images
Carnival told Inside Edition the device had been turned over to the FBI and that the Whites have been informed about this.
The cruise line said it also followed procedures and notified the US Customs and Border Protection.
"This is certainly a unique and unusual occurrence and it is unclear who or why this transmitter was placed in the guest's stateroom," the Carnival spokesman added.
"The safety and security of our guests and crew is of paramount importance and we have taken measures so that this sort of situation does not happen again."