Geotagged photos are automatically given a link to show where they were taken in the google map.
This plugin will allow you to post geotagged photos to your blog and have them automatically linked to a google map.
This works by checking every image in your post and if its got geotag data it will add a icon in the top left of the photo which will open a map in a thick box when clicked. This plug in will also open any photos in a thick box also. The thick box is part of the plugin and does not need extra plugins to work.
Once installed make sure you add your google maps api key in the setting window.
For a example look here : placemarkers.co.uk