Refer: https://ringsaturn.github.io/tzf-web/?markers=%5B%7B%22lat%22%3A47.562%2C%22lng%22%3A5.273%7D%2C%7B%22lat%22%3A49.254%2C%22lng%22%3A10.129%7D%2C%7B%22lat%22%3A47.1%2C%22lng%22%3A8.415%7D%2C%7B%22lat%22%3A47.66%2C%22lng%22%3A8.617%7D%5D&lat=47.648275&lng=8.618689&zoom=13 