Making TMC to work on Mio devices with iGO is not a "casual" procedure like on many other standard pna's. All the necessary procedures has to be manually configured with some additional apps like FMx-Receiver tool..I suggest you to read this topic from the beginning and maybe you succeed.
Thanks janch for the link,
when i run the FMx it dosen't detect my tmc receiver.
also editing registry didnt help maybe because they got the build in tmc on the MioSpirit that apparently works different.
the C320 dosen't have a build in tmc i had to purchase the tmc cradle that suppose to work on the MioMap
unfortunately i dont have anymore the miomap app so didnt be able to test it, but i'm still searching for the
MioMap version that supports the tmc.