Yes of course. Up to 50 ft (~15 metres) is quite acceptable for on-road navigation imho (other users' opinions do differ though, i've found). But my point is to check if an outdoor unit such as an eTrex, when not enhanced by WAAS/SBAS and/or GLONASS, will report a similar accuracy to an automotive unit such as your 255 or the OP's 2100 (which don't process SBAB signals and rely solely on GPS sat sigs).
I'm not for a moment suggesting that you should use your etrex like that for practical use. The question is of academic interest only, i.e. to gauge comparative sensitivity of receivers/antennas of the two types of units on more equal terms.
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