But you need to know where your family/friend are. Or can the system broadcast to multiple locations?
I saw some companies develop modern walkie talkie solution without wifi nor mobile signal for emergency rescue or expedition. But they are expensive.
Am I the only one think that the root cause is because lots of upper management treats universities as state owned business. Universities' management always try to expand and lure more students. They don't care if their students' career and their future. Even a factory owner who don't care about their products will slow down the production if the sale doesn't go well. University should not allow to accept more students if certain percentage of their graduated students cannot find a jobs.
I just feel heart broken to see passionate talents get mistreated every year again and again.