Bruce, in your Log there is an option "My Routes" create one called "Round the Lake" or whatever and then add it to the ride you just did. You can then go back through your log to similar rides and add them and you will have a history of the route and see if you are getting faster or not!
This is only available to paying AP users which I think you are.
cool - I worked it our with your advice. Yes the last ride by myself was faster for this year at least - less talking may explain it tho.