Originally Posted By: M_a_x
...In Germany it is required to have a standardized FAK (DIN 13164) in the vehicle. ...


For the curious (like me) here's what DIN 13164 calls for:

DIN 13164 component requirements

Seems easy to find in Europe, harder in North America (Amazon didn't seem to have any w/o expensive addons).

However, Ebay has a few - here's one (just as an example - I have no experience with this vendor or product:

DIN 13164 kit on US Ebay
Backup link, if above link doesn't work
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)