Did the job,
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This review is from: 6 x Membrane Screen Protectors for Garmin eTrex 20 / 30 - Crystal Clear (Glossy), Retail Package, Installation Kit (Wireless Phone Accessory)
These are perfect for the eTrex. Nice and thick and easy to apply without bubbles. They increase the reflection slightly but it's barely noticeable. After a few previous GPS units getting easily scratched in bags and pockets its good to be able to protect the screen.