Thanks John,
One small thing. I had S&T open and planned the route and saved it and then tried to convert to .gpx with S&T still open but the Export .gpx function was not functioning in Data. I closed S&T and then opened it again using the saved file. Now Data showed the Export function working and I was able to save as a .gpx. Moving the new .gpx file to the Garmin was as easy as you explained. So far I only did a simple route but will try more complicated routes one of these days. Thanks for your tips. Whenever possible I will still be using S&T to plan our routes but we can then use the planned routes in the new Garmin when we use the car.