Hello. I tried to use this app since I have pix4dmapper but the version last year was like I cannot use this app if I ever fly the drone out of my sight. I have read in the reviews also that a certain user got a failing captured of images when the drone is a km away. So what mission size is this app good? I don’t want to take chances since I’m in an urban setting now. Thank you.
Keep in mind that, in most countries, pilots are obliged to maintain a visual line of sight with the drone at all time. This is why we do not recommend to fly the drone too far away from you.
Here is an interesting map with Drone Laws For Every Country In The World (Recreational Use Only).
There is no straightforward answer to the question how big can a mission size be since it highly depends on the area you are flying and current conditions. As you already mentioned, you should take special care when flying the drone in urban areas or close to infrastructure since this can cause the connection problems. On the other hand, mission size can be bigger in open areas.
Maybe some users on the community can provide you some real life examples of their missions.