The Duke and Duchess of Cambridge are midway through their Caribbean tour having visited both Belize and Jamaica.
And three people eager to track their progress on their travels are their three children Prince George, Princess Charlotte and Prince Louis.
The youngsters have not joined their mum and dad on the tour and instead have stayed at home.
But at a reception on Monday, Prince William revealed the sweet way that their children have been keeping up with them - and it appears George is in charge of it.
William explained that George has been sticking pins in a world map of each of the destinations his parents have visited and then sharing the information with both Charlotte and Louis.
He said: "We let them know where we are and he finds us on the map and puts a pin in it and shares with the others."
William and Kate are currently on the second day of their stay in Jamaica and have so far held a meeting with the country's Prime Minister.
They've also visited a hospital as well as a teacher training college, where Kate gave her first, and only, speech of the tour.
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In it, she hailed the work of teachers, who she said play a “crucial” role in shaping societies by nurturing the people children will become.
The Duchess also told the assembled students: “You, as teachers are at the front line of this work and play a crucial role in shaping our societies by positively impacting the futures of literally thousands of young people over the course of your careers.”
The couple signed a visitor's book before walking to an infant school on site. Children waved England flags as they walked by and the Duchess paused to give high fives to some.
Inside a classroom, William met Natalia Young, who was celebrating her fourth birthday and wore a rosette and plastic crown.
The Duke asked how old she was, what kind of party she would have and how many candles.
Elsewhere, the Duchess asked a group their names and ages. She asked one girl: “Who did your hair today?”
She also asked them their favourite colours, telling the children hers was green “because it’s the colour of nature” and that William’s was blue, “like the sea and the rivers.”
The Duchess later described the children as being “so sweet.”
