Mick, that's why I routinely default to using the skills I acquired when dealing with topo maps, compass, where the sun (or other stars) happened to be and a sense of time. Being from south of the equator I only found problems when I behaved as though on auto-pilot in the northern hemisphere. But GPSs are wonderful when you're trying to pinpoint a location out in the middle of the Hay Plain, with its dead flat horizon for 360 degrees, few discernable features and where a bump of 3m is regarded as a hill.

And beware of GPSs that use GoogleMap in their displays.

Cheers, Rowan