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Ian, i am not sure it matters much. I used my Garmin etrex GPS when setting up my CGX in the observatory, or when it has gone to the darker site. I trust it's precision, but of course GPS alone can be 'off' by whatever error factor is set into the system at any time.
In the case of phones, if Location is turned on, then yes some tuning of the position may take place, and if you read the popup detail page about Location, it is claiming better accuracy.
The difference between the etrex and the phone is pretty small in my experience. And if your in a place without mobile coverage, say a dark site like Bretti, then GPS always is the
only choice.
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