Regardless of the developments in electronic navigation this remains an essential requirement for anyone learning and practising astro-navigation.

IMO Basic Documents are free at: https://imo-epublications.org/content/series/basic-documents

The ECDIS Blues is an attempt to systematically answer those nagging doubts in the minds of a navigator. It is a comprehensive guide to passage planning on the ECDIS. Several thumb rules, recommendations and quick checks have been included to make the ECDIS easier to use.

This publication contains all the SIGTTO Information Papers that are in force for 2022, for the guidance of industry members.