Amazon has several golf GPS units available to improve your golf game and assess the course on which you're playing. Check out some of their items in stock at http://www.amazon.com/b?ie=UTF8&node=3411001.
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You can learn about different golf gps units on the following site: http://www.golfsmith.com/browse.php?lcode=expps&N=0&Ntt=gps&image.x=0&image.y=0&Nty=1&Ntx=mode+matchall&Ntk=All. They are very useful.
Most golf GPS systems can pick up the full size of a golf course. There ar golf GPS systems that have the ability to automatically pick up any golf course that you are on as well as keep track of your score and calculate how far a golf ball will go when hit.
Skygolf gps units help golfers determine the exact physical parameters of the golf course. It helps golfers determine exactly the grade of the course is and exactly how far they are from hazards.
I do not think that a gps caddie can help improve golf scores. Only practice can help you with your golf performance. A gps can only allow you to see where you should aim your ball.
The cheapest GPS units include some of the Tom Tom units with less features. Top recognized brands on the market include the Tom Tom GPS and the Garmin GPS units.
The oldest GPS units don't have the capability to make use of the latest Garmin software.Some of it's designed to work on laptops with gps units.
Magellan GPS units are indeed made by the USA. They are, in fact, GPS systems made by the US government in the USA so Magellans are 100 percent USA GPS units.
You can purchase a Golf GPS Rangefinder at most sports stores, or outlet centers. The GPS Rangefinder can also be found for discounted prices online. A golf outlet center can be found here http://www.rockbottomgolf.com/rangefinders.html
Unfortunately, Garmin does not offer a Golf Course GPS package for the Garmin Model 205W. You would have to purchase the Garmin GolfLogix GPS unit.
A golf GPS has your golf course mapped out, and uses global positioning to tell you what yardage you have to certain features, but mainly the green (front, middle and back) It's basically like a sat nav for your round of golf.