Being able to view the map without sharing location would be nice.
Maybe a third option, view without making a report.
Thanks for the feedback. The concern is that the contribution ratio will reduce. Every data point helps paint the bigger picture. Is the concern about privacy? If so, how can I better demonstrate that the data is 100% anonymous?
The concern is about privacy. How to demonstrate anonymity is a good question.
"Privacy: No personally identifiable data is collected. Location data is slightly altered before storage." is a great start. My thought when I saw this, was how long is this information stored, even in an altered form?
Also the question of who this information is shared with. Obviously, it is used to create the map, which is what makes the map great. I think stating whether you share it with other parties, such as google analytics, or other tracking services. I can see from inspecting the page loads, that you aren't doing anything like that, which is great. :)