Given that the Garmin Forerunner 205 is a GPS reciever it only made sense when I learned you can view your workouts overlaid on spacially referenced maps such as Google Earth. Here's what you need:
1) Garmin GPS unit with data logging capabilities
2) Garmin Training Center software
3) Google Earth Pro
4) ForeConv (freeware)
Once you've completed a workout and downloaded the data into Training Center you need to export your history to a TCX file. Then use ForeConv to convert the file to a KML file. From here you select File>Open in Google Earth Pro. Under Places you should notice a folder called History-Data Garmin. All you need to do now is select the workout you want to view. You'll end up with an image like this one of the Noland Trail in Newport News, VA.

At first glance the accuracy of the data looks quite impressive. But a closer look may discourage you from relying on a GPS receiver all together. I noticed substantial deviations or 20 feet or so from the start. As the run continued the margin of error only increased. By the conclusion of my second mile I was around 50 feet off the path, which can be seen below.

When I crossed the final long bridge a little after 4 1/2 miles I'd estimate the receiver had me 200+ feet off course.

It's tough to say at this point if the Garmin Forerunner's poor data collection is the culprit for the errors or if Google Earth's aerials are true orthophotography.
In one of my earlier posts (
February 2008) I stated I had difficulties duplicating distances on clear days during the winter while tree cover was minimal. Based on the randomly weaving data points on straight, open sections of the course it is pretty evident something is up with the Garmin GPS receiver. I still maintain the unit is good for letting you get a decent idea of how far you've run on easy and long run days. The Noland Trail is five miles long and the Garmin Forerunner 205 has always given me a similar mileage total. With a tool like this you can run aimlessly through town, into a park, and down a street you’ve never been on with reasonable accuracy.