While communication and navigation are notable features of the 3 Plus, the reason many users carry an inReach device is for safety, like being able to use the SOS feature for an emergency. The SOS “button” on the 3 Plus is well marked and easily accessible, located on the unit’s left side under a plastic cover that flips up and out of the way when needed, preventing an accidental push that triggers an alarm. What’s new with the 3 Plus is the ability to send an SOS by voice command.