Hello, for people who have experience with the Reach M+ and M2 modules I present these operating tips when using the M+ and M2 with the DJI Phantom 4 Pro for PPK capture and processing, using the PPK Kits from Metta Technologies and Tuffwing .
Taking into account that today the maximum frequency of capture or recording of positioning of the M2 module is 10Hz (10 records per second).
Based on this feature, to achieve maximum precision in capturing positioning data during drone flights, we can recommend the following:
 Select the highest possible frequency according to the number of GNSS systems you require. For example: In the M2 module: GPS + GLONASS, frequency 10Hz.
 So far this is the best flight mode option: “Hover & Capture at a Point” (Speed can vary between 3m / s to 15m / s).
 If you are flying in the “Capture at Equal Distance Interval / Time Interval” modes, the speed of the drone should not exceed 5m / s. Remember that at higher flight speed the precision range may decrease, therefore the speed should be as low as possible according to the availability of operating time and the number of batteries.
 Regarding the flight schedule, it is recommended to fly in the hours when the Sun’s height above the horizon is ≥45 sexagesimal degrees.
 Image overlap: According to the type of terrain.
Flat terrain: Longitudinal: 60%. Side: 20%.
Undulating terrain: Longitudinal: 70%. Side: 30%.
Mountainous terrain: Longitudinal: 80%. Side: 50%.
 In any case, at least 3 control points must be placed on the ground in order to readjust the final processed data.
Please, I ask for your opinion based on your experience with PPK surveys and processing. Thanks.