10.12.2020 - By : EMTC
Definitions of terms to be used in connection with ARPA performance IMO standards
| Each reference | means a facility for indicating that a particular fixed navigational mark, which is being tracked, is to be used as a ground stabilised reference. *For the purpose of these definitions there is need to distinguish between sea and ground stabilisation. |
| Trail Manoeuvre | means a facility to assist the observer in making the correct manoeuvre for navigation and collision avoidance purposes. |
| Suppressed Area | means an area set up by the observer within which targets are not acquired. |
| ERBL | means the electronic range and bearing line used to measure bearings and/or ranges. |
| CPA/TCPA | stands for closets point of approach (CPA) and time to closest point of approach (TCPA) limits from own ship as defined by the observer, to give warning of when a tracked target or targets will close to within these limits. |
| Bow passing Prediction | is the situation association with a target, which is crossing or predicted to cross ahead of own ship. |
| Bad echo | is the name associated with a tracked target which appears to have temporarily lost or which has a poorly defined radar aspect, so that it does not have tracking ability. |
| Lost Target | is the name associated with a target that is no longer being tracked due to having bee lost or obscured. |
| Sea Stabilisation | is a mode of display where by own ship and all targets are referenced to the sea, using gyro heading and single axis low water speed inputs. |
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