What's the purpose of the...?

[Ghost Rider]

What's the deal with the positioning sensors on the bottom of the Advanced. I didn't need them on my Standard. They take up weight and drain power. This drone has a fan and needs to warm up. My Standard didn't need a fan or to warm up. Why is that? What is the fan and the warm-up period for? Please say Lightbridge. I could live with that.

 

[flpholt]

for flying indoors helps hold position better

 

[flpholt]

standard does have warmup same as advanced but if you due a cold imu can decrease the time

 

[alokbhargava]

When GPS is not available, VPS can help maintain position upto certain heights. It thus adds to stability.