Hi Tony
I am using iSailor from a number of years. I happy with it and find it easy to use, create routes, alarms, etc. It is also well readable in the cockpit (but not in direct sunlight).
As I am sailing in the Med I did not buy the Tides&Currents option, which is an add-on available within the app.
I attach herewith the user manual so that you may have look at the available features.
Season's greetings, atb
Oliver
PS. They have been recently taken over by Wartsila of Finland, but the software features are unchanged for what I can see.