When using PE in bright sun light and switching on GPS the dimming of the GPS button is not noticeable. When it takes a bit longer to calculate a GPS position I tend to press it again because I’m not sure I pressed the button properly (thus switching it off!).
It would be helpful to use a more distinctive color (maybe yellow, consistent with the recalculation of a route for instance).
The blue color for “GPS activated” is fine by me, since it is consistent with the other buttons (Tracking and Orientation).
Sometimes it takes a bit longer for GPS to be activated (when in the mountains or woods, when there is no A-GPS signal nearby), and when switching on while riding a bike a more distinctive colour for “establishing GPS connection” would be helpful.
The OSM maps are incredibly complex. Many if not most of the PE icons are a bit too subtle (beautiful, yes! but a bit subtle) to really stand out against the “background” map and be immediately legible.
So, in this case, how about switching to a simple gray background with a white question mark while “establishing GPS connection”? Make it pop!
I don’t think it has to pop out. Just distinguisable that it is establishing GPS connection so you don’t press it again by mistake, thus switching it off again. On = blue is distinctive, so is another color or a blinking blue/gray
I think I can release the next beta by Monday. This beta will include a new Sidebar Menus UI and a flat UI appearance (like iOS 7 will have). This means all buttons have changed. For now we are trying orange for the enabling button. It seemed to work better than yellow and some other colors we tried.
Anyway, you can give your feedback on the new style once you get this beta.