I love these kinds of map notebooks! One small note: my longitude is -122.84034278116127 and my latitude is 38.06118958261439, which your inputs don't seem to accept. I changed the range of the inputs and got it to work, but thought I'd mention it to you in case I'm missing something fundamental and you have a better solution.

Hi Dunstan, they should be able to accept those values, but I have the sliders rounded off to the nearest 1/10 as it grabs the nearest tile. Can I ask what you had to change the range of the inputs to in order for it to work for you?

Oh, right, that totally makes sense. I just removed the `step` from the input, but of course I could have just entered a less precise value, such as -122.8, 38.1. Somehow that never occurred to me, even though I work here. That's ridiculous! Sorry!

I'm getting runtime errors ("demData could not be resolved") for zoom levels above 14.

Good catch, thanks!

I'd suggest to control the auto rotation angle via a uniform, so that you can pause the rotation while the terrain is being dragged.