It is easier than ever to follow your family and friends as they run the London Marathon this year.
Organisers will once again provide live information on those running the race through their official tracker app, in which you can follow particular people.
The smartphone app makes it easy to follow your loved ones - and also advise you where the nearest pub is if you want a quick drink while you wait for them.
Now in its fifth year, the app - which is under the name of The Official 2019 London Marathon App - is available on both iPhone and Android and can be downloaded now ahead of the race.
The app is the go-to place for event week and race day information, as well as letting you track particular runners through the race.
Split times and finishing positions are updated as the race goes on, with first aid and drinks spots all included on the interactive map.
"The app basically pulls in all the information from our timing system," said Jason Ochoa from the London Marathon team a couple of years ago.
"That information is based on timing mats that runners cross over after every five kilometers.
"The app extrapolates from pace a rough position of each runner between each five kilometers."
However, a little warning before you go crazy on the app: it can be a little draining on your phone battery, so make sure you have your phone charged fully before you leave the house, or consider taking a portable charging device along with you.
