Bear in mind that that article (and the ones referred to within) focus more on the auto navigation aspects of a GPS Satnav, like those used in vehicles when driving. i.e. those that automatically prepare a route for you once you enter a destination and use a voice prompt to direct you to your destination.
The majority of mistakes referred to in those articles are still those derived from user error - people entering wrong addresses (eg. that lady from Brussells who ended up in Croatia after not checking the address entered), or people not paying attention to physical road attributes and relying purely on the GPS's voice instructions.
With regard to bushwalking/hiking GPS, there is usually no "auto routing" capability. On entering a coordinate, the GPS will usually provide you with a straight-line, "as the crow" flies route. To follow a trail, you will need to enter the various waypoints manually. So any mistakes made would be again user error, and the same thing can happen with paper maps if you don't check your planning.
Remember, that if you have topo maps on a GPS or smartphone/tablet, these are just digital maps. Even if you turned off the devices GPS, they will still act as digital maps.
When I have walked in unfamiliar areas, I will check my digital maps against paper maps to see if there are any differences. Typically if I have purchased digital maps from State Land authorities there are no differences. In cases where I have used OSM maps, I have mostly found the digital maps concur with physical maps. The benefit of OSM maps is that some will have existing tracks or logging trails marked on them as well.
Neo - Did you pop over and look at ashley burke's website?
http://members.ozemail.com.au/~aburke/navigation.html You could email him and see if he is still running navigation weekends.
But definitely get out there and give it a go with your GPS as a backup. The Suunto A10 compass should be fine. I had the M3 Global which I lost on a walk last year and not replaced yet. An orienteering mirror compass like what Lophophaps recommended can be easier to navigate with but a good baseplate compass is a good start.
An important thing to remember - make sure your GPS's datum corresponds with your paper maps datum so that you are comparing "like for like" coordinates. If you have the GPS's topo maps enabled, always check the destination is the same as the intended destination on the paper maps.
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As a side note, I love using Satnav GPS in cars and I would not go back to paper maps while driving. I recall back in the days before widely available GPS, in my first job I had to inspect various properties around Metro Melbourne and in country Victoria. Driving to unfamiliar sites with a Melway book map and the VicRoads country maps on my passenger seat or on my lap is something I never want to do again. The country maps in particular, were woefully lacking in detail, and I had to pull over and do u-turns several times!