"在地图上标出" can be translated into English as "mark on the map" or "indicate on the map".
"Mark on the map" emphasizes the action of physically or digitally placing a mark (such as a symbol, dot, or line) on the map to denote a specific location or feature.
"Indicate on the map" conveys the idea of showing or pointing out something on the map, often through the use of labels, arrows, or other visual cues.
Both expressions are commonly used in contexts where it is necessary to visually represent information on a map.