You’ll have to be more specific.
The Garmin website lists 12 different eTrex models (eTrex, eTrex Camo, eTrex Euro, eTrex Legend, eTrex Legend C, eTrex Legend Cx, eTrex Summit, eTrex Venture, eTrex Venture Cx, eTrex Vista, eTrex Vista C, eTrex Vista Cx).
The different models range from no built-in memory, up to 24 MB built-in memory, to using a replaceable microSD card (which currently go up to 2 GB).
Update:
Sorry, the basic eTrex is not a mapping GPS unit. It has no built-in mapping memory, does not have a base map, and does not support mapping software.
You’ll have to be more specific.
The Garmin website lists 12 different eTrex models (eTrex, eTrex Camo, eTrex Euro, eTrex Legend, eTrex Legend C, eTrex Legend Cx, eTrex Summit, eTrex Venture, eTrex Venture Cx, eTrex Vista, eTrex Vista C, eTrex Vista Cx).
The different models range from no built-in memory, up to 24 MB built-in memory, to using a replaceable microSD card (which currently go up to 2 GB).
Update:
Sorry, the basic eTrex is not a mapping GPS unit. It has no built-in mapping memory, does not have a base map, and does not support mapping software.
Up to 24 Mb built-in memory, depending on which Etrex unit. The basic yellow will not take mapping software.