How to fly up F11 4K Drone without GPS mode

When long push Speed button of remote, it will change to "ATTI mode"(without GPS mode), It can fly up without wating GPS signal. and drone 4 light below motor are solid on, not flashing, it can fly up by push left stick up.
Drone link:
www.amazon.com...
This ATTI mode, can fly the drone indoor. but not hovering one position cause without GPS.thanks.

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