No idea,try it and find out.

When I mounted a VHF 2m Jpole onto the RX4 I used a peice of 25m x 25m
angle line and made a braket to fit to under the tow ball,I also did
this on the same car with my UHF antenna for an undercover op.
Also for my scanner antenna's.
My wifi antenna  is just one of those magnetic things from ebay,I just
plong it on the roof.
Why put it on your windscreen,It is in the way there,no matter how small
it is.

No-one ever hassled me except when some crazed person got on VHF 2m and
started suggesting the end of the world was nigh....lol
there were son duious moments while I thought of every radio ammature in
Tasmania tring to track where the signal came from.

I have no idea about Vic. I've decided to ignore
the startup screen on my suction mount GPS here
in NSW. There is a disclaimer in the ARRs that ....
"unless a navigational aid" I think it is one. YMMV.

Shaun P blathered on in GPS windscreen mount:

Seems as long as police are using them, you'll be fine.

That's the required short answer::::::

But 'where' the sucker is attached might become a problem - you'll be
forced to haveachat with 'authority' if they figure the sucker and it's
appendage are deemed to be obstructing your view.
And rightly so - for purely practical reasons.
If there's a law about that out there it might be one of the few good
ones - at the moment I believe most states have at least a prefunctory
statute about obstruction of vision somewhere or other.

Natch, it'll get redrafted a few times to turn it into a crock of sh.t
attempting to explain the obvious in eleven different ways any time soon.

Stop right there if you plan on whining about too much information on
your enquiry:::::

For what it's worth, I reckon as soon as a market for the devices
begins to 'level out', the stick-on version of the things will likely
be banned. Again, for obvious reasons, but that'll happen after the
political donors have made a packet.

Look to a remote GPS antenna and some form of din mount LCD with voice
prompting from the unit if you want to do the right thing in terms of
your own vision out the front of the car.
Must say, I much prefer to see someone stopped beside the road reading
a map than to have to drive with imbeciles all about me who are
attempting to enter text into the dam things.
As a passenger, I've threatened to strangle cabbies who muck about with
data terminals in moving traffic - don't see a hell of a lot of
difference between that and mucking about with a GPS device except I
can't get at the perps as easily.
The devices are apparently interesting toys for those unable to read
maps and challenged memory systems -a couple of couriers I know swear
by the things- but they're newbs:-)
Anyhow, I'm waiting for a few more non-sensis machines to hit the
market for reasons I've explained here in the past. And they'll have to
be almost as cheap as maps:-)

HTH - always willing to assist with REAL road safety.

--

Toby

It would only be illegal if it obstructed the drivers view of the road
significantly, keeping it as low as possible would minimize that.
Another issue might be the light from the unit distracting the driver at
 night but you could turn the light off and just use voice directions
at night.
They have been around for a long time and if there is a problem with the
legality of them being mounted via a windscreen suction mount I've never
heard it mentioned here or anywhere else.

Daryl

How about relocating it on the side window?
Should work just as well?
Murray