Re: "whether the Navy should be abandoning low-tech backup solutions"
Your radio ops should also know Morse, so you should have a few people around to help. It's pretty much a required skill for Radio ops in the military, don't you know?
After all, how else do they send out instructions on how to down those pesky Alien spaceships that hover over our major cities, with their invincible shields, unless you sneak on with a pesky computer virus? :p