How does the NOAA "WX alert" function exactly on a Btech GMRS-Pro?

[WRVE426]

I have purchased a Btech GMRS-Pro and I love it!  I just have two questions about it:

 

If monitor two channels, say one GRMS and one repeater channel, will the radio still be ready to receive NOAA warnings if I set NOAA on "WX alert"?  Because if yes, then it means that the radio actually monitors 3 frequencies, the two channels PLUS NOAA, right?

 

Also, when traveling, do I need to scan and select the local NOAA channel and somehow select it for the "WX alert" feature to work or will the radio do that automatically while I travel?

 

Thank you