Once POI mode is engaged, you'll get this screen, and the drone will begin circling. The slider in the center sets the speed of rotation (defaulting to 2.0 mph to the right), the time per loop is calculated, and the current altitude and radius are shown. The "Pause" button does exactly what you think - it pauses the circling (tapping the physical pause button will accomplish the same thing). "Reset Heading" will yaw the drone back around to face the center of the orbit.
While the circling speed can be set up as high as 15mph, the drone struggles to hold the radius at high speed. It is quite likely to drift out if you try this - I'd suggest that if you want a fast circle, recording it slow (2-5mph) and speeding it up in post production is the way to go here.
Point of Interest Controls
While you're in PoI mode, the helpful cheat sheet is wrong (at least for Mode 2, the default control mapping). The left and right stick "left and right" directions are swapped between the two sticks. DJI's Quality Control at work...
The altitude control works normally - push up to ascend, pull down to descend. The gimbal will not
automatically follow if you do this - you'll have to re-aim manually.
The yaw control (left stick, by default) will yaw the drone around - but this is an offset to the point of interest. If you yaw left 90 degrees, it will always point 90 degrees to the left of the point of interest. If you spin it around 180 degrees, it will always point directly away from the center of the circle. The "Reset Heading" button in the right pane will yaw the Mavic Pro back around to point to the center.
Forward and backwards translation requests (normally the right stick up and down) will increase and decrease the radius of circling - no matter which way the Mavic Pro is pointing. If the drone is pointing at the center of the circle, they work normally, but if it's pointing any other direction, they still adjust the radius.
And, finally, left/right translation requests stack on top of the current base speed (set with the slider) to move the drone around the circle. Push right, it moves right around the circle (counterclockwise), and left will move it left (clockwise). Again, these are independent of the direction the Mavic Pro is facing, but work more or less normally when pointing at the center of the circle.
Exiting PoI mode is pretty much the same as any other mode. Tap "Exit" on the slider, hit the red "X" on the left side of the screen, or hold the physical pause button on the controller.
Point of Interest Map View
For PoI flights, map view is quite useful as it shows the path flown and, most of the time, the intended path of flight. If all is working properly (which... often it isn't), a blue circle will indicate the current radius of flight. Sometimes this circle isn't drawn properly (the right side is missing here), but you can often see at least some of it. The orientation is visible here as well - the drone is facing away from the center of the circle. It's useful for checking on the location and status in flight.
Atti & Opti Modes
If the Mavic Pro can't get a GPS lock, it will fall back to "ATTI" or "OPTI" flight modes. This is normally a bad thing if you're not expecting it, but just in case, I'm discussing them.
"OPTI" means that there's no GPS lock, but the ground sensing system can find the ground and stabilize the hover. In this mode, altitude is normally limited to about 10 feet - it's a low altitude mode. This is also likely the mode you'll find yourself in when flying inside (but, seriously, you shouldn't be flying the Mavic Pro inside).
"ATTI" means that there's no GPS lock, and there's no optical stabilization. You know those cheap quadcopters that drift with the wind? Congratulations, you're flying one of those. Unfortunately, there's no way to force the Mavic Pro into this mode for practice - so... good luck. Landing immediately and accepting that there will probably be prop damage is a good option here. This shouldn't happen in flight unless something is seriously wrong with GPS.
This is a rating of the current geomagnetic storm activity. From the site, "The principal users affected by geomagnetic storms are the electrical power grid, spacecraft operations, users of radio signals that reflect off of or pass through the ionosphere, and observers of the aurora." That means GPS users - those signals go through the ionosphere.
Is this actually likely to be an issue? Probably not, but the Mavic Pro seems a bit more sensitive to this than some other drones. If it seems like it's taking a long time to lock onto satellites, or is wobbling around a bit more in hover, this could be related. Or it could just be windy. I mention this for completeness, since it's a term you'll see tossed around a lot.
DJI Go Swipes
And, finally, did you know that you can put the DJI Go app into a full screen mode, and have quick access to useful shortcuts? You can!
Swipe up or down on the screen and the app will enter full screen mode. This gets you the full screen space for the image, but also gets rid of all the instrumentation, so I can't say I recommend it.
Swiping left gets you a much more useful set of toggles - rotating the camera between portrait and landscape modes, flipping the gimbal straight down or to the horizon, setting the home points, and adjusting your display brightness.
Personally, I don't use these modes that much. Point of Interest is somewhat useful, but Tap to Fly and Fixed Wing Mode both feel like toys to me - I can come up with some use cases, but I'm stretching.
The Attitude & Orientation indicator is amazingly useful, especially in course lock modes - and being able to see power delivered in Sport Mode is helpful to avoid overstressing things on a low battery.
And Point of Interest will let you capture "Drone around a point" videos without having to hand-fly them!
Next week, I'll finish this series up with a comprehensive list of menu configuration options - but this week finishes out the flight modes!