GPS Audio out question

Hope you guys can help, because we sure could use some!

We have a thread running here:-
https://www.ukgser.com/forums/showthread.php?t=86332&page=1&pp=16

And the question is, can you light an LED with the audio out from a Garmin type GPS? (Preferably a nice bright one!)

Many thanks for any comments (well, nice ones that is

ues high impedance amplifier like op amps to amplify and convert to dc weak audio signal to drive LED

Thanks Penoy, can anyone recommend any basic components or circuits that could be adapted.

Thanks again