Welcome to subsim Wooster.
I'm pretty sure that these radio calls are just sort of color text and even if you find your way to that lat long either they will be long gone or never existed at all.
I could be wrong however it would be better to ask in the appropriate forum section as its been a long time since I dabbled with SH3.
Try asking here...
http://www.subsim.com/radioroom/forumdisplay.php?f=182