Hi there @Fatbitch, it is nice to have you here as a new member of the Fitbit Community! In order to map your walks is require to use any feature that includes GPS. depending of which tracker are you using this features may vary since not all tracker are capable to work with GPS, but the app provides also this feature though MobileRun. For more details please take a look to this post: How do I use the Fitbit app to capture GPS data?
I saw in your Community profile you have a Charge 2, so if this is true you'll will have also connected GPS feature. In this case the following post: Connected GPS Information will give you more information if you are interested to track your walks with GPS.
Hope this helps and let me know if you have other questions.
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