Hi Bugman, I probably travel the outback with my mates to, NSW, SA, QLD & NT at least once every two years and sometimes more often.
Over the years we used to use paper maps and in fact some of my mates still do.
I have the Hema maps loaded onto my iPad Air and have had it for about three years. I find it easier to handle than paper and it has never let me down.
One thing to keep in mind, if you are going to use it on an iPad you need an iPad that can take a chip. These have an inbuilt GPS and you will not need telephone service to track your trip.
Can't comment on the Hemma device.
Hope this little input helps.
One final tip. As you purchase the Hema maps through iTunes, it is a good idea to wait until you find iTunes gift cards on sale, then you will be able to purchase the Hema maps app at a discounted price.
Sent from my iPad using Tapatalk