Updating the tz3

If there are updates for the other components, yes. You should have all Furuno devices turned on and connected when doing the TZT3 update.
 
We can look at these one at a time.
Fish Finder: If you are using the built in Fish Finder on the TZT3 then YES, the TZT3 update will update the internal sounder. If external (networked) sounder see here under TZ Touch/2/3 SENSOR UPDATE - HISTORY. See if you model number is listed. If the model is listed then you can use this SW load to update: https://v1.furunosoftware.com/auth.html

RADAR: Same SW link as above.

SCX20: Same link to SW page, scroll down to SCX20. This update requires a windows laptop.

Depending on the model number of the autopilot as to the update method but, they are done independently of the TZT3.
 
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