And not having downloaded off line maps is a rookie error.
Experience.
Good judgement comes from experience.
Experience comes from bad judgement.
Not always. It can come from research and thought. You don't need to have the bad experience, you just need to think what bad experiences can happen and then apply a measure. A risk matrix. Proper planning prevents poor performance.
@Greenbank started
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And not having downloaded off line maps is a rookie error.
Experience.