In my Nuvi the Auto Drive Hellas map (both the "Latin EN" and the "Greek EL") is regularly loaded and listed as yours Auto Drive (Hellas) 5.00 (Ml En Nt) Tracer - Geodata (this is the Latin EN one); I have also other countries maps installed.

During my tests on this v. 5.0 and when inserting the route, for example from Austria to Greece, I imput for first the "nation" and if I have the "Latin EN", I'm unable to choose Greece; if I have the "Greek EL" map installed, I'm able to choose the nation but it's not listed as "Greece" but like "ΕΛΛAΔΑ" and then I can only continue by digiting with Greek characters. This odd behaviour was also found in the previous v 4.50.