lock screen button or is this a good place?

[jusc]

I wonder if this is a good place for the lock screen button, particular if you are riding your bike?
What if you only want to lock the zoom level for better viewing   I´m not sure, if I hit always the right buttom.  

[Menion]

it's a question on some poll ...

do you know about ability to define default action on a buttons? Just long-click on this lock button

and finally ... I think on a bike during a ride is problem hit almost everything ...

[jusc]

do you know about ability to define default action on a buttons? Just long-click on this lock button

No, I didn´t know it. And yes, it helps. But in my eyes the older solution was a bit smoother. So I vote for this.  

[Menion]

three votes ... c'mon others, help to decide

[Menion]

oki, six votes (not much btw.) so function remain for now on it's place. To all who do not like, I suggest long click on zoom-lock icon and set default action of this button from list of available actions