A commercial gps is used by commercial trucking companies, bus drivers, and "professional" rv drivers to allow drivers to navigate America's. A good commercial gps is the WorldNav GPS because it is affordable, has a high resolution, and even a touch screen.
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The top commercial GPS brand is Shell that provides 24-hour GPS services for any hand-held GPS devices around the world. The GPS resolution provided by Shell is up to 1 meter radius.
There are good and inexpensive GPS systems for trucks. These GPS systems for trucks include Garmin Nuvi 465t 4.3" GPS Truck Navigator and IntelliRoute TND Truck GPS.
If by gold GPS you mean GoldStar GPS, it does have good reviews. People who have purchased it claim that it works great.
Tom Tom is one of the most popular brands of the GPS. You will find that Alexandria Morgan, is in the Tom Tom commercial. She is helping with advertisement of the Runner Cardio with a built in heart monitor.
SiRF Technology, Inc. was a pioneer in the commercial use of GPS technology for consumer applications. The company manufactured GPS navigation software, and GPS navigation devices.
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The Garmin Forerunner 405 GPS are an accurate brand of GPS and a good watch.
A good GPS handheld that you can buy online is probably form best buy. they have some of the most best GPS's there. they all work good and have a battery for a long time
Garmin is one of the largest manufacturers of GPS systems. I hear that the Garmin Astro 220 is a very good GPS. Garmin has very good customer support also.
Bestbuy.com would be a good place to start looking for black gps systems. You can also try looking on amazon.com. They have good prices on gps systems.