Working With Optional Settings on AnyTone Radios
There are a lot of things going on with the Anytone Optional Settings (within the CPS, Highlite and read in the Comment box at bottom), most of which are the same across the Anytone line (mobile and handhelds). Many of them are not well detailed, but always check the AnyTone Manuals both in your CPS/FW download Software and Online versions.
Here are some outside resources:
http://hamradio.joomla.com/images/PDF/Digital_APRS_Settings_D868_Anytone.pdf
N1CLC: Anytone AT-578UV Review / Thoughts & Nits
And 868/878 Optional Settings: