Memory-Map Professional works in a similar way. You must have a connection to the internet and it sends your position data to the server. Then, anyone who has the Memory-Map program can download the positions of all users in that account (could be multiple users being tracked).
Thank you for the information. Due to the price difference, I think I will hang on with Tracky for a while. Tracky is only about 1/10 of the price for Memory-Map Professional. (€20 or €30 depending on Tracky Lite or Pro.)