I think I "cheated". When I purchased my 310XT - I still had the old "Training Center" software on my computer from older version Garmin Forerunner. With the ant stick in - I would open the TC & ask it to "receive from device". Once that was done I could go up to the menu - click on "view" & the last option was; "view in (date) in Google Earth". That would open Google Earth & my track would be displayed - such as it is now on Garmin Connect, but with all the controls that are part of Google Earth, including the option to save as a jpeg image. Now - I've a new 310XT with the new smaller ant stick & have installed "Express". (Having had to delete the old stick software for the new software to work.) The Training Center now seems unable to receive any new information...
Anyone else have any experience with this? The overlay with Google Earth has been one of my favorite features, since I'm always scouting for new trails.