On his 2015 record voyage, Robert brought two different types of personal locator beacons. One (left) would transmit a signal to alert search and rescue professionals of his position in case of an emergency while the other (right) would transmit to commercial traffic. (U.S. Coast Guard photo by Petty Officer 2nd Class Nate Littlejohn)

Photo by: Petty Officer 2nd Class Nate Littlejohn |  VIRIN: 150925-G-LS819-1001.JPG