Ex Machina
Second Officer
Flight distance : 1806362 ft
United States
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fans0fbc2f60 Posted at 2017-2-8 13:56
The "Follow Me" mode requires a strong GPS signal for the device used with the MAVIC RC controller. iPhone, or iPad that has the GPS capability is not so good, because these devices use what is called "assisted GPS" (fairly inaccurate) rather than a true GPS chip. This is because the true GPS chips at this point have too high power consumption, more than an iPhone, or iPad can accommodate. I use an iPad mini2 to fly my MAVIC. It is a "wifi only" iPad, so it has no GPS capability. I found that that a pocket device called "BAD ELF GPS" is an ideal complement for my iPad. It connects to the iPad over Bluetooth and the DJI GO 4 app recognizes it and uses it in the "Follow Me" mode. It provides a strong GPS signal, much better that an iPhone, or iPad cellular that has the "assisted GPS". I tested the "Follow Me" mode with the BAD ELF and it works well.
Glad you found a solution for your GPS-less iPad, but I take issue with your description of Assisted GPS -- all that technology does is leverage nearby cell towers and wifi access points to speed up position acquisition. Your iPad doesn't have a GPS because the wifi-only model doesn't ship with a GPS chip.
As far as position accuracy goes, all the iPhones I've ever owned gave me at best +/- 16ft accuracy, whereas my dedicated GPS would sometimes be able to give me +/- 9ft, which I think is the theoretical maximum, so, in that sense, you are correct that a dedicated GPS device can be more accurate.
In the case of Follow Me mode, I'm not sure that accuracy level makes much of a difference to the real-world performance. |
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