Nope on the WAAS for Australia at the moment.
Right now, if you have a WAAS enabled receiver you should turn the WAAS option OFF as it can seriously degrade the performance on the few occasions that it gets enough sattellites to derive a common solution.
The problem is that if you are steaming along with eight or nine sats firmly in lock (very common now) for the most part WAAS will not see sufficient sats to derive a solution and simply ignore the corrections.
However, occasionally at certain times of the day, the geometry is such that four common sats are visible and when that happens, the remaining non common in view satellites are dropped out of the solution.
That leaves you with only four used satellites that have very poor geometry and a very poor solution due to the high PDOP. While RAID should drop the WHOLE GPS out under those circumstances, it isn't very nice if you're in the middle of an approach.
As for the Garmin100, as much as I like them, I would NEVER use them for IFR (it's not legal anyway, by any stretch of the imagination) because they have no health flagging of bad sats and CAN be several kilometres in error if a "bad" sat is used. Have seen it happen.
Also, they're only a single channel unit and have to multiplex between the sats for the ranges and will never be as accurate as the newer GPS units.
And was the question a wind-up ?