The deadline for work-in-progress submissions (up to 1200 words) of the LBS 2021 conference has been extended to September 15 September 22. If accepted, you are invited to give an oral presentation at the conference and an abstract or full paper (your choice) will be published in the online proceedings of the conference (with a DOI). High-quality work-in-progress submission will be invited to submit the extended version to be considered for Journal of Location Based Services, or Journal of Navigation.