David Burch Navigation Blog

A polar diagram is a graphic presentation of a sailboat's sailing performance in various wind conditions. The same information is also o...

Scatterometer wind measurements are the truth meter for weather work at sea. There are several sources, but the ASCAT data from EUMETSAT ar...

The workhorse of global ocean current forecasts in grib format is the RTOFS model. It provides ocean surface currents and sea surface tempe...

Most navigation programs (electronic charting systems, ECS) will read and display AIS targets provided to them by a live AIS receiver on the...