"They want to get a city map."

Translation: 他们想拿一张城市地图。

[duckmaestro]

Is 他们想拿一张城市的地图。 ok also?

[14minx14]

我觉得你的句子不错。

[Marosaxamit]

城市地图 is better. 的 is usually used when noun B belongs to noun A: A的B. But when A describes some quality AB without 的 is enough.

[JChien6953]

I said 一个 instead of 一张

[14minx14]

technically it should be 一张 because things like flat things (piece of paper, table) take this counter/classifier 张