Glad that fixed it. I do plan to add contours to the map at some time, although it would cost me more for the data, so I would have to charge extra for it. At the moment I am trying to increase the user base so I don't want to do that, because it would put people off.
However if the app ever gets more popular then I may add some "Pro" features, and charge extra for them. Only for extra features though, not for any existing ones.
"Pro Features" sounds a good way to deal with it. No objection in paying a bit extra for that 👍🏻