Calibrating maps on Oziexplorer

Please don't send me to Yahoo. I can't follow the threads and its more confusing than foreign policy.

I have just started to use Oziexplorer version 3.90 and I am yet to get it out in the car and use it as a moving map. What I have at the moment is the Austlig Raster 250K series which came on 2 CD's. It covers all of Australia.

I intend to use it with a laptop and a Garmin 176C in the car. The Garmin 176C is set to WGS84 and all my waypoints to date have been obtained in that GPS and in that datum. I have the Metroguide and Blue Charts for that machine as well.

My question is: -

1. Do I have to calibrate the maps that I use in the Austlig set?

2. If the answer to that is YES then how the hell do I do that. Dumb your answer down, I won't be offended at all.

3. If the answer is NO then how reliable are the waypoints that I have already got going to be when used on the moving maps. [And not the Garmin Metroguide?

4. Is there a decent book that explains Oziexplorer for gumbies like me or is it a case of use and learn.

I will be back for more no doubt but I will appreciate any help that I can get.

Dave