Telling your bank you're going to be travelling is a sensible move, since otherwise transactions from overseas are likely to be flagged as suspicious. Too many of them and your card may be suspended altogether, which is a massive nuisance.
You can notify banks of your travel plans by phone or by visiting a branch, but doing it online is much simpler. I suspect it may also be more reliable. I once informed the Commonwealth in person and then still had my transactions flagged anyway.
Do other online banks in Australia also now have this feature? Tell us in the comments.