i read a lot of avation forums and no one can give absolute answer for this....most of them gives referance from jar-faa but still i quess every pilot not using this altitude so much.MORA derived by jeppssen(it must be not offical so how can u use it?) but moca is a offical altitude pls correct me if im wrong.Finally can we say in msa use approach plate altitude in flight for an emergncy use moca for emergency on a airway segment or decent below icing conditions and use mora for vfr aircrafts?????????