It depends, a lot, on your philosophy toward navigation.
There is some discussion about that aspect in the sticky thread about using smart phones for navigation purposes.
As far as your OP is concerned, no modern smart phone needs a SIM card in order to be used as a navigation device via a multitude of apps that are on the market.
I believe you are right in your assessment about your Etrex; they are pretty much lacking in memory capacity for the current range of maps on offer is my understanding of the products - just one reason why the models are updated at regular intervals.
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Dave
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