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Changing your preferences
You can change your preferences for how the walk lengths and heights are measured. To do this log in and then click 'Change my details' at the top of the page.
On the right you will see a panel with a number of preference choices. Set these as you wish (changing the speed and time spent for breaks will alter the estimated durations for walks) and click to save them. Note that you may need to log out and log in again to make the preferences take effect but thereafter they are permanently set until you change them again.