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Cameraless takeoff includes no triggering of any sort. You are on your own for entering your own camera/lens parameters in the "Custom Camera" entry in the Settings.
Overlap is our only setting since Map Pilot is made for mapping. You should be able to figure out the distance between images by using the altitude, focal length, sensor parameters and overlap setting.
You can use any 3rd party data source using ArcGIS or Mapbox as a source:
https://support.dronesmadeeasy.com/hc/en-us/articles/115000168726-3rd-Party-Basemap-Mapbox-Share-URL
Yes, you can import GeoJSON and KML data into Map Pilot:
https://support.dronesmadeeasy.com/hc/en-us/articles/211429163-Opening-a-KML-from-Email
There are no size limits for KML/GeoJSON features.
Map Pilot Business is an app you purchase from the App Store. It does not have any recurring fees associated with it.
Since it is purchased on the App Store it can be used on any device that is logged in with the purchasing Apple ID. Devices logged in with different Apple IDs will need to purchase the app separately.
You can request custom features and they will be evaluated as to whether or not they are useful to the general Map Pilot user base or not. If it is not directly applicable to lots of users you can pay for the engineering time required the feature to the app. Email mapping@dronesmadeeasy.com to discuss specific features in more detail.