![]() ![]() IMCA’s store terms and conditions ( ) apply to all downloads from IMCA’s website, including this document. All information is anonymised or sanitised, as appropriate. Please consider adding to your internal distribution list for safety alerts or manually submitting information on incidents you consider may be relevant. The effectiveness of the IMCA Safety Flash system depends on Members sharing information and so avoiding repeat incidents. IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of all. Diving System Inspector (ADSI) Accreditation.Diving Supervisor and LST Certification.Environmental Sustainability Self-Assessment.Legal, Contracts, Insurance & Compliance.If you suspect that jamming is an issue in the area where you work, please report it to the local law enforcement authority. Jamming of GNSS signals is illegal in most countries. Whether in urban or rural locations, on construction sites or piloting a UAS, the detrimental effects of PPDs and other sources of jamming can be considerably minimised thus reducing downtime and costs due to lost man hours.ĪIM+ is available on all current Septentrio GPS/ GNSS solutions. Uptime guaranteedĪIM+ technology brings considerable cost benefits to users of Septentrio’s GNSS solutions. When WIMU is enabled on a Septentrio receiver for example, the ‘ No RTK Zone’ indicated by the red region, is reduced from several hundred metres to a few metres effectively confining the range of the jammer to inside the car it’s plugged into. The white triangle indicates the location of a 10 mW chirp jammer in the centre of Tampa and the red zone is the region in which the jammer knocks out the GNSS signal. The effects of WIMU are also illustrated in the Figures below. Interference Mitigation activated Interference Mitgation activated Recent years have seen an increase in drivers turning to cheap GNSS jamming devices, such as those shown in Figure 1, in order to move around undetected or to thwart built-in anti-theft systems.ġ0 mW Chirp Jammer without RFI 10 mW Chirp Jammer with WIMU RF Such devices ensure for example, that drivers don’t exceed legal driving times or avoid road tolls. The construction site was close to a busy thoroughfare frequented by commercial vehicles whose movements are often monitored by tracking devices that include a GNSS receiver. Without warning, GNSS positioning was lost, warning messages appeared on the screens of the operators’ guidance units and work ground to a halt resulting in days and weeks of machinery down-time and lost man hours. ![]() ![]() The foreman knew the position of each vehicle down to the centimetre. An army of excavators, bulldozers, piling rigs and graders were operating in a confined area with their activities carefully orchestrated by an RTK guidance system. Here’s what can and did go wrong on one building site of a major construction project. You’ve got your base station setup in an open environment, its position has been properly surveyed and it’s tracking signals from all satellites visible overhead with good signal-to-noise levels. The €50 device that brought a multi-million euro project to a standstill. ![]()
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