Any additional communication skill would be handy to know about should it become necessary to use alternate communication methods in times of emergencies when normal communications are disrupted. Since the Internet controls practically everything we do, and enemy would want to disable our Internet access to cripple our communications. We would then need alternate ways to communicate voice, text and data. So a practical use would be to practice and gain experience ahead of time, and then hope you never have to use this as a last resort