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Garmin GTM 21

alaTest has collected and analyzed 45 reviews of Garmin GTM 21. The average rating for this product is 3.4/5, compared to an average rating of 4.0/5 for other GPS for all reviews. People really like the size and price. The design and performance also get good feedback, whereas comments are divided on the reliability.

usability, performance, design, price, size

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Garmin GTM 21 is awarded an overall alaScore™ of 73/100 = Good quality.

Review analysis

(Based on 45 reviews)

User Reviews  

Showing 34 review(s)

Expert Reviews User Reviews


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Showing 1 - 34 of 34 Show Reviews: in English | in other languages (11)

Consumer review ( review summary for Garmin GTM 21


alaTest has collected and analyzed 34 user reviews of Garmin GTM 21 from The average user rating for this product is 3.1/5, compared to an average user rating of 3.9/5 for other GPS on Reviews about the size and performance are on the whole positive. The price and design also get good feedback, but there are some mixed views about the reliability.

usability, design, price, performance, size

65% of the reviews on give this product a positive rating.

This summary is based on the products: Garmin GTM 21 (UK) FM TMC Traffic ReceiverGarmin GTM 21 (UK) FM TMC Traffic Receiver

Mar, 2018