PA31 orbiting over North-west Sydney

[Gerard M]

Was just wondering if anyone has any info on this aircraft on what its doing/what it is? I heard it just now in the backyard and its still going. Orbiting from North to South for a while now.
From the looks of it it might be doing mapping maybe as it seems to be moving over every orbit?
This screen shot from webtrak and it is on there currently if you want a better look (can't figure out how to make the attachment bigger). I think its been at about 7000ft the whole time.


Thanks in advance.