SeeYou Navigator helps you stay out of forbidden airspace. It will help you stay out of airspace by showing two levels of warnings and a playing a sound alarm when the danger is imminent.
When you are 1-2 km away from an airspace, a compressed airspace information is displayed at the top of the screen. The arrows are pointing towards the nearest point of the airspace horizontally and vertically. Note that you can expand the notification by clicking on the "down" arrow on the right.
As soon as entering airspace is imminent (i.e. less than 30 seconds if you continue in the current direction), the Airspace warning expands to show data more clearly and plays an alarm sound. On the example screenshot below, the left arrow is pointing towards the nearest point of the airspace. The arrow on the right is poining up, because that's the shortest way to avoid the airspace vertically.
Note that you can slide the airspace panel to the left in order to disable this particular airspace warning as shown on the picture below
If you continue to fly into the airspace, a red Alarm and sound will be presented once you cross the border. The airspace warning turns red indicating that you are already inside the airspace.
Note that you can still dismiss the warning by sliding the Airspace warning panel left and pressing the "Disable for today" button.