pb geofence on 2.9

hi everyone,
I'm trying to experiment geofence on arducopter 2.9, but i can't activate it in the flight planner, the writing is always grey.
I have tried to activate the "lim_" command in the parameters list but it seems to do nothing !
Do i miss someth

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pid diagram ?

hi to all,

firstly I would like to congratulate the team of developers and all those who contribute to develop the ardupilot/arducopter

you are all doing impressive work on this project

I'm a relatively new user of apm 2.5, and i try first to integrate

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