Fine tuning on FM would not serve any purpose. In any case the fine tuning is for receive only. Baofeng is type accepted only for amateur bands. MARS/CAP mods are bogus. They are just an excuse to open up radios which are not type accepted outside the ham bands. The NTIA which governs the federal radio spectrum currently lists no ham radios as type accepted for CAP. None. This is because CAP is narrowband and moving to P25. Using a handheld on MARS frequencies is unlikely even if you were a MARS member.