Special attention is put on the problem of Malmquist bias.
The bias is revealed and overcome by an advanced version of the method of normalized distances, taking into account, in addition to the apparent diameter limit, also Hubble type effect, inclination effect, and variable galactic extinction. Calibration of the Tully-Fisher relations is primarily performed using a sample of 15 galaxies with available Cepheid distances, mostly from the HST programmes. This insensitivity is also expected from our numerical experiments.