Garmin Striker 4 NMEA Output??

[Leeway]

I've been serraching for the same purpose. It is RS232 112.500 bauds and it is a propietary protocol.
Look at this post https://blog.openwww.org/garmin-high-spe...r-network/

I've obtained this:
¯►♥►&♦┼╦┤Û¿►♥►♠☻&Ê►♥► üL ♫☺Striker 4 Software Version 2.70VERBMAP NoneVERSMAP NoneVERSPLSCRN Splash Scrn, 200x70, RGB5551, GARMIN 2.00BACKLIGHT LEDÆ►♥►♠☻ ¨►♥►·☻¨♂►♥►♠☻·■►♥►♦

And, after a while, it sensa the same sentence every 5 seconds
T☺AdDnA╔D╩DnDÊA-☺D8☺D.☺AÉ☺DnAX☻DX☻AY☻DY☻A╝☻D╝☻A ♥D ♥Aä♥Aå♥Aç♥AY☻DY☻Aï♥Dï♥Dî♥Dì♥DÄ♥T►♥►♠☻²¹►♥►²cPL☺A

I think it is a bidirectional protocol thar wait to a query.

Supose that it is very hard to decrypt and we need an echomap to know what are the querys.

Best regards