This is the 4896th most frequent Russian word.
карте
"Карте" is the dative or prepositional case of "карта," meaning "map" or "card" in English.
In this sentence, 'карте' is the prepositional case of 'карта', meaning 'map'. It is used with the preposition 'на', indicating location on the map.
Посмотри на отметку на карте.
Look at the mark on the map.
Here, 'карте' refers to a 'coaster' for placing cups, demonstrating a shift in meaning from the context of 'карта' as a map.
Чай на карте уже остыл.
The tea on the coaster has already cooled down.
In this usage, 'карте' specifies 'карта памяти', which translates to 'memory card'. It again uses the prepositional case with the preposition 'на'.