After owning a Spark for some time now I am surprised at what it can do. Using Litchi waypoints I can achieve trips of 5 to 6 km distance, (not distance from controller.) Using a parabolic antenna that will maintain contact with the aircraft and a OTG cable the Spark will undertake waypoint missions up to 6 km in length or possibly more if you do not travel too far from the home point. If you set speeds of around 40 to 45 kmh the Spark will easily achieve these sorts of distances. This is in calm conditions. If you have direct line of sight with the aircraft as you are required to do, the signal will remain strong, however anything between you and the aircraft will affect the signal, this includes trees. If you have set Litchi up correctly the Spark will continue a waypoint mission even if the link between controller and aircraft is lost. It will also utilse the DJI failsafe return to home if the aircraft determines that there is insufficient battery to complete the the mission. You will find that using a waypoint mission seems to make more efficient use of the battery, I can usually travel a combined distance of 5 to 6 kilometres and land with around 30% battery capacity remaining. Set the waypoints so the aircraft climbs slowly to the cruising altitude and likewise, set the waypoints to descend as the aircraft approaches the end of the mission.
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