Completely agree with flybymike and Pilot.Lyons (and not just because I am aware of my own navigational shortcomings). On the other hand, being unaware of own position with CAS nearby and apparently unreachable on R/T (let alone proactively talking to ATC) strikes me as slightly odd.
Was once guilty of a minor infringement myself (without any consequences for other traffic as far as I know, just clipped the edge of a "CAS above 2500ft" piece of airspace when I believed I was still in a "CAS above 3500ft" piece). As I was quite close to my home aerodrome and still on their frequency, the ATC guy/gal from the big airport nearby made an educated guess, phoned the aerodrome tower and asked them to gently tell me to descend or buzz off (I did both, quickly and red-headed, and that was it, no further complaints from anyone). Point is: to be completely unreachable for ATC it would appear that one has to almost make an effort, or maybe I was just lucky.