I have found Hover (UK) not bad. Blue... Aerodrome Traffic Zones, para drop sites, etc Red... Danger areas, prohibited areas. I think also HIRTAs (high intensity radio transmission areas. I think if you click on them they tell you what they are. Timer is OK, and the front end is a onestop shop for basic weather and Kp. I prefer the original data (decent weather/space weather website, CAA website etc) but Hover is fine for a quick check in the field.