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Cobra GPSM 4000 Nav One 5-Inch Portable GPS Navigator

alaTest has collected and analyzed 29 reviews of Cobra GPSM 4000 Nav One 5-Inch Portable GPS Navigator. The average rating for this product is 3.7/5, compared to an average rating of 4.0/5 for other GPS for all reviews. Reviewers really like the design and price. The performance and screen are also mentioned favorably. Many are critical about the reliability and maps.

usability, screen, performance, price, design

maps, reliability

We analyzed user and expert ratings, product age and more factors. Compared to other GPS the Cobra GPSM 4000 Nav One 5-Inch Portable GPS Navigator is awarded an overall alaScore™ of 71/100 = Good quality.

Review analysis

(Based on 29 reviews)

User Reviews  

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Consumer review ( review summary for Cobra GPSM 4000 Nav One 5-Inch Portable GPS Navigator


alaTest has collected and analyzed 24 user reviews of Cobra GPSM 4000 Nav One 5-Inch Portable GPS Navigator from The average user rating for this product is 3.8/5, compared to an average user rating of 4.0/5 for other GPS on Opinions about the design and price are on the whole positive. The performance and screen also get good opinions. There are some mixed reviews about the size. There are some negative reviews about the reliability.

usability, screen, performance, price, design


83% of the reviews on give this product a positive rating.

This summary is based on the products: Cobra GPSM 4000 Nav One Mobile NavigatorCobra GPSM 4000 Nav One Mobile Navigator

Mar, 2018

Consumer review (

Cobra GPSM 4000 5.0" Handheld GPS Receiver


Thank you for contacting Cobra. Unfortunately the mapping company is no longer supporting updates for the following GPS units: 2750, 2950 3000 4000 4500 models.

Great looking and easy to use

NO MAP UPDATES FROM COBRA!!! I emailed Cobra and they will not be offering any map updates at all for this unit. This is coppied from the enail I received from Cobra... Thank you for contacting Cobra. Unfortunately the mapping company is no longer...

Jun, 2008

Consumer review (

It works but...


Overall, I love this unit, but hate the lackluster customer support from Cobra. Several emails about this product, posted via their own web site, have gone ignored for months now. Based on the quality of the unit itself I'd rate it 4 eggs, but the...

Excellent display size, and the auto-brightness feature is very good. Takes a little while to learn, and the on-board help functions work well for most things. Accuracy seems to be excellent at +/- 15-20 feet. Traffic info reception also works very...

The POI database needs updating, but there seem to be no updates beyond August of 2006. Has an annoying tendency to want to take any road that goes to the right, then rejoin the main road. (It keeps wanting me to drive through the entrance driveway...

May, 2008

Consumer review (

Good Value for a Basic GPS


My girlfriend and I recent took a trip from Colorado to California; without GPS the task of navigating and driving in portions of California would have been next to impossible. If you want a good value GPS with traffic updates but where cutting-edge...

Large, bright screen. Navigation and directions given are good to excellent. Six million points of interest

Some of the points of interest are out of date (last firmware update was in 2006). Sometimes the unit is slow to calculate directions, especially from a standstill--it likes to be moving when calculating. Traffic data works fairly well and will...

Apr, 2008

Consumer review (

Don't buy This


I bought this because of the Cobra name - I wanted a good functioning GPS that would just work - This is not it. Read the warranty - Newegg will NOT take it back.

Big Screen - Easy to understand / View / and Work

Basic purpose of GPS - THE MAPS - they are out-of-date and wrong. Major streets are mis-labeled. Map shows turns where roads do not exist (and I've lived here for 40 years). POI also out of date. No internal battery (not portable). Cobra is...

Mar, 2008

Consumer review (

Excellent GPS


Fits perfectly in center dash opening of BMW X3 - without any accessories.

Large bright screen, traffic information, two routes to choose - the fastest and the shortest, options to avoid highways or toll-roads

Bulky, no built-in battery. On few occasions it tried to convince me to leave straight route and accomplish right turn, U-turn, right turn on intersection. Other that that - no complaints

Mar, 2008

Product Specifications

Cobra Electronics is a leading global manufacturer of mobile communications products for consumers, having attained a leadership position in every market in which it currently does business. Cobra has a track record of designing innovative and award-winning products.PRODUCT FEATURES:Automatic Route Navigation;Portable Vehicle Navigation System;Automatic Route Navigation;5" Touchscreen High Resolution, Ultra-Bright Color Display;Over 7 Million Points-of-Interest;Automatic Re-Routing;Personalized Route Preferences;iA.S.A.P. (Intelligent Accelerated Satellite Acquisition Protocol);North America Street Level Detail Map;Easy Map Access;Trip Data;Trail Capture;3D Maps;Terrain Maps;Sensor Light.