There already are clocks with GPS (but maybe not eink): try searching for seiko space link clocks eg https://www.sakurawatches.com/index.php?route=product/produ

There already are clocks with GPS (but maybe not eink): try searching for seiko space link clocks eg https://www.sakurawatches.com/index.php?route=product/product&product_id=12025 https://www.sakurawatches.com/index.php?route=product/produc...