code: def speed_convert_units(self, val_ms):
          '''return a speed in configured units'''
          if self.settings.speed_unit == 'knots':
              return val_ms * 1.94384
          elif self.settings.speed_unit == 'mph':
              return val_ms * 2.23694
          return val_mf speed_convert_units(self, val_ms):
          '''return a speed in configured units'''
          if self.settings.speed_unit == 'knots':
              return val_ms * 1.94384
          elif self.settings.speed_unit == 'mph':
              return val_ms * 2.23694
          return val_ms
docs: return a speed in configured units