Swarm Problem of two boats used the rover-firmware

Ground Control Software Mission Planner
1

Hi，
i have two boats used the APMRover3.3 Firmware, i want to swarm them, but when i did every procedure just as the mannul , the followers just stay there. Has anyone had this problem.
thanks a lot please give me some advice

2

what manual are you using? link?

3

Hi, thank you, i had fixed the problem. Use the old version GCS.