GARMIN RINO 650
Garmin $599 garmin.com/au ★★★ The Rino aims to combine easy, reliable communication through a two-way radio system with in-built GPS to let you know where you are, and where friends using the same device are. Sadly, it doesn’t like cold water, which wasn’t ideal given the fifth obstacle in the course included a short submersion in almost frozen water. The device went into a hibernation mode. It did come back online later in the course, though water presumably got to the speakers because the walkie-talkie was so quiet voices couldn’t be understood. With more time voices could be heard more clearly. It will survive, but don’t plan on using it at short notice if you fall into a river during winter.