alaTest has collected and analyzed 2 user reviews of Garmin GPS 20x - GPS receiver module from Amazon.com. The average user rating for this product is 2.5/5, compared to an average user rating of 4.0/5 for other GPS on Amazon.com. Reviewers really like the usability. The size is also mentioned favorably, whereas there are some mixed comments about the performance.

I needed access to the raw GPS messages from the receiver and this unit seemed to be the best way to go since the new car units don't seem to support data output any more.