Satellite positioning for boats: technology for control, safety and monitoring
Satellite positioning is now one of the most important tools for increasing control of a boat and improving safety under way. Modern GPS and AIS systems, along with dedicated emergency devices, make it possible to know where the vessel is, to monitor its movements and to make coordination easier when it is needed.
As marine technology has evolved, solutions have become more accurate and more integrated, useful both for ordinary navigation and for handling emergencies. It is worth distinguishing, however, between the positioning systems the owner installs on board and nautical assistance services, which act on the information the customer provides and on the operating conditions at the time of the request.
Marine tracking technology: GPS, AIS and integrated systems
GPS and marine tracking
Marine GPS systems determine a boat’s position by connecting to the satellite constellations available. The more advanced devices can use several networks at once — GPS, GLONASS, Galileo and BeiDou — which makes the position more reliable even in difficult areas or in less favourable operating conditions.
GPS positioning is useful for navigation, for recording routes and for giving precise coordinates when assistance is requested. When the skipper has a correct, up-to-date position, communication with the Operations Centre and with any rescue services is faster and more effective.
Some integrated systems can also talk to onboard instruments, marine apps and monitoring platforms, letting the owner keep track of movements, stops, routes and the boat’s main parameters.
AIS for monitoring vessels
The Automatic Identification System, known as AIS, is widely used in the marine and shipping sectors to identify and monitor vessels under way. It transmits essential data such as position, course, speed, MMSI number, vessel name and other technical information where available.
AIS works on dedicated VHF frequencies and lets boats with a compatible set see other vessels in the area. That improves situational awareness, especially in busy waters, near harbours, along commercial routes or when sailing at night.
While it does not replace the skipper’s attention or the ordinary rules of navigation, AIS is a valuable aid in preventing collisions, assessing surrounding traffic and passing on useful information when needed.
Communications and emergency equipment
Beyond GPS and AIS there are devices designed specifically for safety at sea, such as EPIRBs and PLBs, which send distress signals over dedicated channels. Properly installed, registered and used, they can help locate a vessel or a person in difficulty.
EPIRBs are normally associated with the vessel and can activate automatically in certain conditions, while PLBs are personal devices that must be activated by hand. Both should be chosen and managed according to the applicable regulations and the manufacturer’s instructions.
These systems should not be confused with nautical assistance services: they are safety equipment that can support the transmission of a position, while coordinating the response depends on the type of emergency, on the competent authorities and on the operating conditions at the time.
