Narwhal supports both metric and imperial units for all dive details.
When you first install and open Narwhal, it will default to the units of measurement set in your iOS system preferences.

If you prefer different units with Narwhal, you may follow the steps below:
Changing the unit of measurement will convert all existing dives logged to the new unit selected.
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If none of these steps resolve your issue, please reach out for further support at [email protected]
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