Okay so I traded my 1GB Mini SD Card w/ adapter for my father's regular sized 1GB SD Card he recently purchased for his camera. (lucky me, eh?) He tells me the mini SD Card & adapter work perfectly in his camera. And the regular sized SD Card works perfectly in my Explorist with no satellite communication problems whatsoever. I come to the conclusion that no Explorist owner should ever purchase a "Mini SD Card" (no matter how cheap it may be) as there is good chance it will kill the satellite reception. Of course it is still possible that it's only my unit that is acting this way, but I doubt it. I played around with both cards and always got the same results, no matter where I was.
It would be interesting if someone else out there could verify this issue. 'Nuff said.