I ordered a new mamba f405 a few months ago and I am curious whether it is possible to have loiter mode on Mamba f405 flight controller like one in pixhawk ?
The Betaflight firmware has very few GPS assistance modes. AFAIK, the only one is GPS Rescue Mode which allows the quad to return to where it took off in an emergency.
For more GPS modes, I'd recommend looking into the iNav firmware, which has a lot more options for you and supports the Mamba F405 flight controller. The iNav GPS mode you'd be looking for is the
NAV POSHOLD mode, which allows a multirotor to maintain a constant 3D location in space.