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Having recently acquired a Garmin iii, I wonder how many rely solely on this gadget.
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The first principle of Navigation is that you never rely solely on anything! If you do you will live to regret it one day.
Navigation is the art of colating a variety of information of varying accuracy. Whilst GPS is capable of a very high degree of accuracy, it can disappear and is subject to random errors that the operator is unaware of. Thinking you are precise to 45 metres (not 10) is all very well, but you might be 5 miles displaced with no indication that anything is wrong. Even the rather inaccurate NDB can indicate whether you are N,S,E or W of its position.
If you are flying IFR then you will have a variety of equipment to build a pictiure of your position.
If you are VFR then you should be looking out of the window most of the time, its called "LOOKOUT" You will have a map and should know where you are, if you are unsure, look at the Lat Long on the GPS, place your finger on the map where your GPS says you are and identify the features.
Anyone who relies SOLELY on GPS is an IDIOT