I guess it should be treated like any other navaid. That is first of all the student must have a thorough grasp of the fundimentals of navigation, map reading, log keeping DR nav etc, then be introduced to navigating using aids, including GPS.
We are definately spoiled these days, thats for sure, there is never any question of ones location. Although i always like to tune & monitor ground based aids wherever i can just to make sure, or a visual fix if you can.
But like all things electronic, a little water in the wrong place and its back to blowing the dust off those WAC charts, pulling the pencil and ruler out and drawing a line on the map and going back to the basics.
Perish the thought of a student heading out on Nav 3 relying solely on Gps. perhaps some current stuents could answer.
Cheers
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