3 ms·
It's a question of where connectivity is available and how easy it is to track. For example, how do you replace a submarine surfacing somewhere to receive a pre
by rlpb 16y ago
It's a question of where connectivity is available and how easy it is to track. For example, how do you replace a submarine surfacing somewhere to receive a pre-scheduled radio transmission?
- ruslan 16y agoThey use VLF/ELF to send "message pending" and/or some other very short predefined signals. Russian military transmitter (ZEVS) is still operating on 82Hz frequency and uses Earth as an antenna. http://en.wikipedia.org/wiki/Extremely_low_frequency http://en.wikipedia.org/wiki/Extremely_low_frequency