@alamel
Can you disable WAAS on your eTrex Legend HCx? That would be a fairer 'accuracy' comparison with a car unit like your Nuvi255. Some WAAS/SBAS enhanced devices are switchable.
@IGNATRON
Your etrex 'yellow' units have grey or mono screen? That could be the discontinued eTrex/eTrex H (both WAAS), or the current eTrex 10 which can also receive both GLONASS and GPS signals simultaneously. Either way, can you disable GLONASS and/or WAAS then do a comparative side-by-side accuracy test with your 2100?
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