Stay up to date
Roads change all the time in Korea. If you have the AVOL GPS from AAFES Exchange you might want to make sure you have the latest maps, especially if you bought your BX / PX GPS unit from someone who bought it from someone.
First check your GPS to see what map version you have.
Here are the steps to see how current your map of Korea is:
I created a tutorial for you to follow.
AVOL GPS map update page
Map updates are available for Avol GPS models: HN850S, HN700, HN90R8, if you have an older GPS model you might be able to contact Avol at firstname.lastname@example.org, to see if any of the map updates are compatible with your model.