Has Sonocaddie ceased trading? I can no longer use the app and can't get on to a Sonocaddie website.
SonoCaddie website is not out of the business. In fact, you can browse the page related to this product using the following link: http://www.sonocaddie.com/v350/Buynow-Package.aspx
I have checked the website and I was able to visit all the areas on the website. If you want to get in touch with the developer, use the Contact US page (last button on the navigation menu).