While the fitness fans and charity fundraisers among us will trek 26.2 miles through central London, many more will simply watch from the safe haven of the touchline.
But if you have a loved one running the marathon, is there another way to track their progress?
There is indeed – it’s called the official TCS London Marathon app.
The app lets you see where individual runners are at all times as they make the hours-long journey to the finish line.
The participant must download the application on his device, via Apple App Store and Google Play.
They will need to enter their booking reference number, along with an email and date of birth.
Finally, the last step is to enable GPS tracking on the device. This should be done well before the race, as the cutoff for GPS operation is 15 minutes before the start time.
You can’t just walk in and follow them, though — the attendee will need to approve your email address in the app.
To make sure you can track their journey the same day, give them up to two email addresses to approve before the race kicks off.
Enter them into the app and you should be good to go.
It’s also important to note that while this is a great feature, it will only work when you have a GPS signal.
The map should be updated every two minutes when the signal is strong, but it may not update at the right time.
To learn more about the app, you will need to download the London Marathon Event Guide through the official website.
How to watch the London Marathon on TV
BBC Two begins coverage at 8.30am, with BBC One taking over from 9.25am to 2.35pm.
You can stream all day on BBC iPlayer and the BBC Sport website between 8.30am and 5pm.
Highlights of the day will air at 5.20pm on BBC Two.
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