Compass

Are there any English dialects in which the word "compass" is pronounced /ˈkʰɑmpəs/ instead of /ˈkʰʌmpəs/?

I've been saying it the first way for as long as I can remember, but everyone around me (Southern California) uses the latter pronunciation, and my boyfriend insists mine is "incorrect." Since I don't know where else I might have heard my pronunciation before, I'm not sure if I picked it up from a different dialect (I've lived in several places in the US, as well as Canada) or if I've just been mispronouncing it all this time.

Thanks much.

Edit: Forgot the stress, although that's not the focus of the question anyway. I just like IPA :\