NSW Google Maps admissible?/ICV Subponea

[Timed.0ut]

Hi there
So i'll be challenging an alleged speeding offence in the near future and would like to know if Google maps is admissible as evidence in court. In particular distances between a number of points on the map.

Also, as the ICV footage( I have viewed) is vital to my defence would I need to serve the police a subponea for production of the footage.? Do I do this before the "mention"? Do I take possession of the footage?

Thanks