IMCA has published new guidelines on the installation and maintenance of DGNSS-based positioning systems, covering the many technical, procedural and contractual issues before, during and after installation that users of this equipment need to be aware of.
This document, produced jointly by the Marine and Offshore Survey Divisions, offers broad guidelines on the installation of global navigation satellite systems (GNSS), including GPS and other satellite systems available such as the GLONASS system.
Users of this equipment need to be aware of many technical, procedural and contractual issues before, during and after installation. The document covers the basic components of a satellite system and highlights some of the consequences of a poor installation, before going into some detail on the phases of installation. Checklists for pre-installation work are offered, including such matters as antenna location and cable routing. The installation phase is covered in some detail, particularly the matter of proper siting and fitting of antennas and cabling and the possible issues affecting reception of satellite signals, such as multi-path, obscured satellites and interference from other radio sources. There is information on the below-decks equipment required for GNSS systems and a section on the operational phase, including configuration and calibration of equipment, validation of data and ongoing maintenance.
These guidelines are also available with the reference IMCA S 012.