Is Satellite Communication An Alternative In a Grid-Down Crisis?

This is an excerpt from my book Emergency Preparedness and Off-Grid Communication. One option for communication when internet and cellular services are not available is a device that connects to a satellite network. A personal locator beacon (PLB) is a satellite-linked device that, when activated, sends a distress signal to nearby search and rescue units. Typically used for mountaineering, they can be used in other emergencies, but caution should be exercised. PLBs should only be...