Leave it in your bad... how stupid
...how constructive!
The GPS v Chart is well documented in this thread and many, many others. However, BPF makes a valid point about learning how to use it. For this I believe Microsoft Flight Simulator (Sorry BPF!) might be a cheap and cheerfull way to help you achieve a decent level of familiarity with the Garmin models. Most follow a similar operating system I found from using them on the sim has helped tremendously in my real life post PPL flying. It is crucial that you know how to operate a GPS before you start fiddling about in the air as this can lead to disastrous results!
All the best
Ryan