[TowerTalk] Strange behavior

[jimlux]

On 1/23/17 10:14 AM, Barry Merrill wrote:
> My iPhone 7 does NOT need motion for the Compass App.
> The app immediately rotates to the heading of the phone,
> while the phone was flat on the desk.
>

iPhones (and Samsung phones, as well as basically all smart phones) have 
a magnetometer in them. Like all magnetic sensors, they are affected by 
local conditions..