https://github.com/e3modelling/mrprom/blob/5c6c62e3bc51ded0e26ef5b562df6fbff5103996/R/calcNavigate.R#L30 https://github.com/e3modelling/mrprom/blob/5c6c62e3bc51ded0e26ef5b562df6fbff5103996/R/calcNavigate.R#L31
