eTrex 20/30 Geocaching - Log into online resource > Courses > Garmin - Units > eTrex 20x and 30x > eTrex 20/30 - Geocaching - when logged into our online Training Resource we have some guides to help you with Geocaching with your device.
You can also when logged in view videos for the newer etrex22x & 32x units which you will still find useful for the older model as very similar and there are a lot more training videos for the newer
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