Having spent around 3 million dollars on smart phones(plus or minus) in the last few years I would rely on a smart phone as a navigation device about as much as I would rely on a 3 month old human not to shit its nappy on a 12 hour drive.
They are FAR to fragile and unreliable IMO.
I have a 62s that does the job....Actually the etrex h before did the job fine too.
Often I will take my two smartphones but only if its not going to be wet and there may be service(one on each provider) for txt updates of weather,comming out early,river up staying another day etc but never for nav.
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