As for 2) (“accuracy”), assuming this Best Practice List is aimed at the average Jane/Joe who is probably using a smartphone rather than a dedicated ‘GPS’ device… I’d suggest first and foremost to get hold of a device that is capable of achieving high accuracy [rapidly] (i.e. with dual-frequency and/or EGNOS abilities). This empirical list (online spreadsheet, sourced from benevolent users of a famous ‘GPSTest’ app) should cover the most common brands, and many models.
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