Thousands of mourners have been queuing up to slowly file past Her Majesty Queen Elizabeth II's coffin as she lies in state at Westminster Hall until her state funeral on Monday, September 19.
With more and more people joining the queue, the Department for Digital, Culture, Media and Sport (DCMS) have created an online tracker, using location app What3Words to help people pinpoint the end of the queue on a map.
The queue tracker is being streamed on YouTube, but the DCMS is also updating it's official Twitter in regular intervals for us to keep track of the growing line of people.
Here's everything you need to know about the queue for the Queen's lying-in-state, including how long it is and how to use What3Words to track it.
How to track the queue to see the Queen?
The queue tracker lets you check the progress of the queue on a YouTube live stream created by the Department for Digital, Culture, Media and Sport.
Besides providing live updates, the DCMS has also included a handy What3Words hack, which uses a three-word tag that when entered into the third-party location app or website shows you to the exact coordinates of the end of the line.
The DCMS is also advising that people check TfL for latest travel information.
How long is the queue to see the Queen?
The queue for the Queen's lying-in-state is 2.8 miles long according to the DCMS' most recent update.
The organisation posted on Twitter that queue as of 9.03 am (on Thursday, September 15) stretches up to Southwark Cathedral.
It has also provided the three-word tag – frozen.angel.guitar – that people will need to enter to What3Words for up-to-date tracking of the queue.
What are the waiting times to see the Queen?
The growing queue for the Queen's lying-in-state could see people have to wait for as long as 30 hours for their turn to file past the coffin.
The chance to see Queen Elizabeth II one final time will last until 6.30am on Monday, September 19, which is the day of her state funeral at Westminster Abbey.
Though the line will be open for people to join 24 hours a day for the next four days, government officials have also said that the line may close early if it gets too busy.
Keep up-to-date about the queue via DCMS official Twitter.
What is What3Words and how to use to find exact location of queue for Queen?
What3Words is a geocoding app which divides the world into 57 trillion three-metre squares, randomly assigning a three-word code to each square.
Highlighted as a "simple way to talk about location," the advantage of this app is that it puts an end to unclear or hard-to-find addressed by using the three-word code to identify precise locations instead.
If you're planning to join the queue for the Queen's lying-in-state, you can use what3words code, which the DCMS posts about at regular intervals to find out what landmark is nearest to the end of the queue.
You can simply use the unique code provided and enter into the app, which is available on smartphone, to find out where the queue ends.
You can leave your tributes to Queen Elizabeth II here
