Re Stallie's
"Off the top of my head the Aust SAR region stops at 075E."
Correct. The western boundary is from (old - maybe still) posn. LATEP at around 6S 75E, all the way down the 75E to 'infinity and beyond'.....
The other side of the border is Mauritius FIR, so I guess the 'maritime' boundaries are the same.....
FJDG (Diego) is in Mauritius FIR also.