On: Show HN: Offline SOS signaling+recovery app for disasters/wars

[keyle]

This is awesome. Technology put to good use.

Can voice be transferred? Message be recorded and rebroadcasted?

What about making the device vibrate SOS pulses. The person at stake might not have the strength to tap or bang, may be able put the phone on a metallic surface and send vibrations?

[nizarmah → keyle]

I appreciate it :D

Those two questions are spot on.

Voice cannot be transferred yet. Re-broadcasting might require a bluetooth meshnet.

Vibrations are a great idea. They are not that battery intensive. They also can be detected by 3rd party tech.

Both were added to the list of ideas. Thank you!!

I haven't done any effort there, because I want to get this into hands.

[ioleo → nizarmah]

Have you considered alternating signals using different radio frequencies? And then use differences in signal arrival times for more accurate location? Also I guess using different bands might be more universal, as signal loss would be different depending on environment and band used.

[nizarmah → ioleo]

I have not, yet. Right now, it's more of a "signaling life" tool.

Improvements are definitely needed with location, but the signal loss as you mentioned is higher priority and restricts what can be used for location.

I'm planning to do my homework about alternatives to help mitigate the signal loss. And from there, the options for location might be clearer.