This app really helped me to visualize holding entries, something I was really struggling with.
Using the DG to determine the entry is very logical for me, as that is the instrument used to enter the hold. Having the ability to practice holds outside of the cockpit is invaluable.
My only suggestion would be to have a setting that turns bearing type holds on and off. While they are a good mental exercise, they are not something I need to practice.
Noshoes4me about Holding Pattern Trainer