Cobra GPSM 4000 Nav One Mobile Navigation System

usability, price, performance, screen, design

reliability, size

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

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...

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...

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Some of the points of interest are out of date (last firmware update was in 2006).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...

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Basic purpose of GPS - THE MAPS - they are out-of-date and wrong.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 POI also out of date.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...

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