David Burch Navigation Blog

Since the very onset of electronic position finding (from LORAN on up to GPS), we have taught that these aids are wonderful tools for tellin...

Since we first proposed the Fit-slope method many years ago, and have used it continually since then, I have just realized that the base re...

We happen to have on consignment a C Plath sextant made for the Kriegsmarine in 1939 Germany. It is a prized collector's item, but we w...

  This is a place holder for soon to follow instructions on the use of our polar wave spectra plots for understanding the seaway and for set...

Background At present all ENC content and structure (internationally) are based on the IHO S-57 standard, and how these ENC should be displa...