# How are the towns on guidebook overview maps selected?

A short description of the algorithm that chooses the localities which are printed on the overview maps.

![GUIBO guidebook overview map](https://4249329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FE2a888ltdx6dUekSgs4U%2Fuploads%2F26qkjJQlma10WTbe9Ttr%2FB6Dij4k_1.png?alt=media\&token=735d1cf0-292f-4b25-b6d0-c6f28708b0fb)

1. Find all cities/towns/villages which are not more than 2.5 km away from any route in guidebook
2. Reduce amount of cities/towns/villages per route to not compromise the clarity of the map. Reduce to

        \- maximum of 3 per route for walking routes

        \- maximum of 4 per route for cycling routes 

        \- maximum of 5 per route for dirving routes. 

Select by highest population