What's the maximum capacity of MicroSD his drone scan support?

256 GB is the correct answer. You do need a fast transfer rate to smoothly transfer at 4K. One of the most reliable Micro SD cards for drones with plenty of speed is the SanDisk Extreme Pro Micro SDXC UHS-1 U3 A2 V30 Memory Card. It has a 4.8 rating and cost about $56.

If I do the math right, the mini combo w/ a extra batteries is actually more expensive than buying the Mini plus separate batteries. Comments?

Not exactly. Unless there’s a sale I’m unaware of, the MSRP on the Mini 2 by itself is $450 which includes one battery. The fly more combo includes 2 additional batteries which are $53 each. So a total of $556. The fly more combo is $600. So just buying the drone and 2 extra batteries would technically be cheaper. What’s also included is the charging bay which holds all three batteries. Which is worth the extra $44 itself (but it can buy bought online for about $35). Otherwise you have to plug the drone in every time you want to charge a battery and to charge all three, you’d have to swap each battery out and charge them one by one. The combo also includes 3 sets of propellers (which aren’t really expensive and you may never need them) and I don’t believe buying the drone by itself includes the carry case, which comes with the fly more combo. You could say that’s worth $15-$20. Which you’ll definitely want to hold everything and protect it. So if you have a case already and don’t want extra propellers, you’d maybe save money buying everything separately. But trust me, you’ll want the charging bay. The batteries run down quickly and take a while to charge. And without it, you can’t charge the other batteries while using the drone.

Can this drone fly a pre-planned grid pattern automatically over a 40 acre parcel of land?

DJI Mini 2 can perform the following pre-planned flights: Helix, Dronie, Circle, Rocket

what drone is comparable to this without geo zones?

The Autel Nano + is roughly equivalent to the DJI Mini 3 Pro. It is more advanced than the Mini 2, Mini 1, or Mini SE, just like the Mini 3 Pro. It has obstacle avoidance, and a camera which is equivalent to the Mini 3 Pro. Autel drones are widely used by first responders doing Search and Rescue missions, precisely because they do not have to waste time on geo-unlocking as they would have to on a DJI drone, when time is crucial for a rescue mission.

Color	gray
Connectivity Technology	USB
Wireless Communication Technology	Wi-Fi
Video Capture Format	MP4
Skill Level	Beginner
Effective Still Resolution	48
Maximum Range	10000 Meters
Includes Rechargeable Battery	Yes
Remote Control Technology	Wi-Fi
Battery Cell Composition	Lithium Ion
Media Type	SD
Video Capture Resolution	4K
Includes Remote?	Yes
Are batteries included?	Yes
Control Type	Remote Control
Special Features	True Vertical Shooting
Item Weight	0.8 Kilograms
Item Dimensions L x W x H	14.3"L x 9.9"W x 2.8"H

DJI Mini 3 Fly More Combo, Lightweight 3x Mechanical Gimbal Mini Camera Drone with 4K HDR Video, 3 Batteries for 114-min Flight Time, up to 32800ft (10km) Video Transmission, True Vertical Shooting

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