How do you decide whether to use a large scale map or small scale map?

The two types of map usually have two different uses. A large scale is better for showing large scale landforms, navigation, or highways between widely separated places. A small-scale map shows more local detail (hills, parks, streets, important locations). You would not use the same map to drive from Dallas to Boston as you would to find a specific location in Boston when you arrived there.

Online maps usually have the capability to display a wide range of scales, making them usable for a variety of applications both large scale and small scale.