@IGNATRON
If your 'yellows' are older eTrex models eTrex or eTrexH, they rely on SBAS (WAAS, etc) for GPS accuracy enhancement. All current eTrex models, including the yellow eTrex10, receive both GPS and GLONASS (which adds up to an extra 24 sat signals) plus SBAS capability so accuracy should be superior to the older models especially if GPS signals are sub-optimal.
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