gps

You can buy the Magellan 510 for less than $300. Not sure what a re-radiating antenna is but my 510 works fine in the car well away from the windsreen.
You will need to by the topo maps as an extra if you need them, about $50 per state or $150 (?) for Oz and NZ

Barry, have you considered a second hand phone? The advantage being that they are much cheaper than a dedicated GPS, and you can load the maps you choose. In my experience, things don't go wrong. They are simple to use, hand held, and can do lots of other stuff as well.
A new HTC Desire is about $150, same as a second hand iPhone 3GS.
Try Telstra store or similar if you are worried about ebay.
So a phone will cost about $150, and a premium mapping app like Hema (or Mud Map) will cost $150.

Barry,

Drop in to Johnny Appleseed (http://www.ja-gps.com.au/). They're in St Kilda Rd and have a wide range of GPS units.

Hi Barry,

Have you considered the Mud Map M7?


- it has both On road and Off road navigation features
- it has 4WD touring maps from 3 map publishers including: Westprint, BackCountry and NATMAP
- It has over 3000 Caravan Park and Campsite POIs included
- Allows you to plan and record your trip with waypoints, track-logs and importing of map data
- Turn by turn street nav with latest NAVTEQ street data
- Can be hooked up to reverse camera
- Good value for money

Check it out here:MUD MAP M7 LINK

Cheers,

Ian