A message in a bottle is easier to use. Also, the maintenance cost is negligible, since the system is powered by renewable wave energy. The only downside is the lag, which can vary from a few days to several centuries.
I know some pensioners in my neighbourhood that'd love to talk to you about that.
I've considered switching to carrier pigeons
Do I have the proposal for you! RFC2549
All you need are two tin cans joined by string.
A message in a bottle is easier to use. Also, the maintenance cost is negligible, since the system is powered by renewable wave energy. The only downside is the lag, which can vary from a few days to several centuries.
I know some pensioners in my neighbourhood that'd love to talk to you about that.