event_description,prolog_rule
"A vessel enters an area, starting the condition withinArea.","initiatedAt(withinArea(Vessel, AreaType)=true, T) :- happensAt(entersArea(Vessel, Area), T), areaType(Area, AreaType)."
"A vessel leaves an area, ending the condition withinArea.","terminatedAt(withinArea(Vessel, AreaType)=true, T) :- happensAt(leavesArea(Vessel, Area), T), areaType(Area, AreaType)."
"A vessel initiates a communication gap, ending the condition withinArea.","terminatedAt(withinArea(Vessel, _AreaType)=true, T) :- happensAt(gap_start(Vessel), T)."
A communication gap starts near ports for a vessel.,"initiatedAt(gap(Vessel)=nearPorts, T) :- happensAt(gap_start(Vessel), T), holdsAt(withinArea(Vessel, nearPorts)=true, T)."
A communication gap starts far from ports for a vessel.,"initiatedAt(gap(Vessel)=farFromPorts, T) :- happensAt(gap_start(Vessel), T), \+holdsAt(withinArea(Vessel, nearPorts)=true, T)."
A communication gap ends for a vessel.,"terminatedAt(gap(Vessel)=_PortStatus, T) :- happensAt(gap_end(Vessel), T)."
"A vessel stops near ports, starting the condition stopped.","initiatedAt(stopped(Vessel)=nearPorts, T) :- happensAt(stop_start(Vessel), T), holdsAt(withinArea(Vessel, nearPorts)=true, T)."
"A vessel stops far from ports, starting the condition stopped.","initiatedAt(stopped(Vessel)=farFromPorts, T) :- happensAt(stop_start(Vessel), T), \+holdsAt(withinArea(Vessel, nearPorts)=true, T)."
"A vessel resumes movement, ending the condition stopped.","terminatedAt(stopped(Vessel)=_Status, T) :- happensAt(stop_end(Vessel), T)."
"A vessel initiates a communication gap, ending the condition stopped.","terminatedAt(stopped(Vessel)=_Status, T) :- happensAt(start(gap(Vessel)=_GapStatus), T)."
A vessel starts moving slowly.,"initiatedAt(lowSpeed(Vessel)=true, T) :- happensAt(slow_motion_start(Vessel), T)."
A vessel stops moving slowly.,"terminatedAt(lowSpeed(Vessel)=true, T) :- happensAt(slow_motion_end(Vessel), T)."
"A vessel initiates a communication gap, ending the condition lowSpeed.","terminatedAt(lowSpeed(Vessel)=true, T) :- happensAt(start(gap(Vessel)=_Status), T)."
"A vessel moves with high speed near the coast, starting the condition highSpeedNearCoast.","initiatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(hcNearCoastMax, HcNearCoastMax), \+ inRange(Speed, 0, HcNearCoastMax), holdsAt(withinArea(Vessel, nearCoast)=true, T)."
"A vessel's high speed near the coast is within the limit, ending the condition highSpeedNearCoast.","terminatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(hcNearCoastMax, HcNearCoastMax), inRange(Speed, 0, HcNearCoastMax)."
"A vessel's high speed near the coast ends, ending the condition highSpeedNearCoast.","terminatedAt(highSpeedNearCoast(Vessel)=true, T) :- happensAt(end(withinArea(Vessel, nearCoast)=true), T)."
"A vessel moves below the normal speed, starting the condition movingSpeed=below.","initiatedAt(movingSpeed(Vessel)=below, T) :- happensAt(velocity(Vessel, Speed, _, _), T), vesselType(Vessel, Type), typeSpeed(Type, Min, _Max, _Avg), thresholds(movingMin, MovingMin), inRange(Speed, MovingMin, Min)."
"A vessel moves at normal speed, starting the condition movingSpeed=normal.","initiatedAt(movingSpeed(Vessel)=normal, T) :- happensAt(velocity(Vessel, Speed, _, _), T), vesselType(Vessel, Type), typeSpeed(Type, Min, Max, _Avg), inRange(Speed, Min, Max)."
"A vessel moves above the normal speed, starting the condition movingSpeed=above.","initiatedAt(movingSpeed(Vessel)=above, T) :- happensAt(velocity(Vessel, Speed, _,_), T), vesselType(Vessel, Type), typeSpeed(Type, _Min, Max,_Avg), inRange(Speed, Max, inf)."
"A vessel's speed is not within the moving range, ending the condition movingSpeed.","terminatedAt(movingSpeed(Vessel)=_Status, T) :- happensAt(velocity(Vessel, Speed, _,_), T), thresholds(movingMin,MovingMin), \+inRange(Speed, MovingMin, inf)."
"A vessel starts a communication gap, ending the condition movingSpeed.","terminatedAt(movingSpeed(Vessel)=_Status, T) :- happensAt(start(gap(Vessel)=_GapStatus), T)."
"A vessel starts drifting, initiating the condition drifting.","initiatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, CourseOverGround, TrueHeading), T), TrueHeading =\= 511.0, absoluteAngleDiff(CourseOverGround, TrueHeading, AngleDiff), thresholds(adriftAngThr, AdriftAngThr), AngleDiff > AdriftAngThr, holdsAt(underWay(Vessel)=true, T)."
"A vessel stops drifting when angle difference is less than or equal to threshold, ending the condition drifting.","terminatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, CourseOverGround, TrueHeading), T), absoluteAngleDiff(CourseOverGround, TrueHeading, AngleDiff), thresholds(adriftAngThr, AdriftAngThr), AngleDiff =< AdriftAngThr."
"A vessel stops drifting when TrueHeading is 511.0, ending the condition drifting.","terminatedAt(drifting(Vessel)=true, T) :- happensAt(velocity(Vessel,_Speed, _CourseOverGround, 511.0), T)."
"A vessel stops drifting when it stops underway, ending the condition drifting.","terminatedAt(drifting(Vessel)=true, T) :- happensAt(end(underWay(Vessel)=true), T)."
"A vessel is anchored or moored, initiating the condition anchoredOrMoored.","holdsFor(anchoredOrMoored(Vessel)=true, I) :- holdsFor(stopped(Vessel)=farFromPorts, Istfp), holdsFor(withinArea(Vessel, anchorage)=true, Ia), intersect_all([Istfp, Ia], Ista), holdsFor(stopped(Vessel)=nearPorts, Istnp), union_all([Ista, Istnp], I)."
"A vessel moves at tugging speed, initiating the condition tuggingSpeed.","initiatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(tuggingMin, TuggingMin), thresholds(tuggingMax, TuggingMax), inRange(Speed, TuggingMin, TuggingMax)."
"A vessel stops moving at tugging speed, ending the condition tuggingSpeed.","terminatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(tuggingMin, TuggingMin), thresholds(tuggingMax, TuggingMax), \+inRange(Speed, TuggingMin, TuggingMax)."
"A vessel initiates a communication gap, ending the condition tuggingSpeed.","terminatedAt(tuggingSpeed(Vessel)=true , T) :- happensAt(start(gap(Vessel)=_Status), T)."
"Two vessels are tugging, initiating the condition tugging.","holdsFor(tugging(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(tuggingSpeed(Vessel1)=true, Its1), holdsFor(tuggingSpeed(Vessel2)=true, Its2), intersect_all([Ip, Its1, Its2], I)."
"Two vessels rendezvous, initiating the condition rendezVous.","holdsFor(rendezVous(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(lowSpeed(Vessel1)=true, Il1), holdsFor(lowSpeed(Vessel2)=true, Il2), holdsFor(stopped(Vessel1)=farFromPorts, Is1), holdsFor(stopped(Vessel2)=farFromPorts, Is2), union_all([Il1, Is1], I1b), union_all([Il2, Is2], I2b), intersect_all([I1b, I2b, Ip], If), holdsFor(withinArea(Vessel1, nearPorts)=true, Iw1), holdsFor(withinArea(Vessel2, nearPorts)=true, Iw2), holdsFor(withinArea(Vessel1, nearCoast)=true, Iw3), holdsFor(withinArea(Vessel2, nearCoast)=true, Iw4), relative_complement_all(If,[Iw1, Iw2, Iw3, Iw4], I)."
"A vessel moves at trawl speed, initiating the condition trawlSpeed.","initiatedAt(trawlSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _Heading,_), T), thresholds(trawlspeedMin, TrawlspeedMin), thresholds(trawlspeedMax, TrawlspeedMax), inRange(Speed, TrawlspeedMin, TrawlspeedMax), holdsAt(withinArea(Vessel, fishing)=true, T)."
"A vessel stops moving at trawl speed, ending the condition trawlSpeed.","terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _Heading,_), T), thresholds(trawlspeedMin, TrawlspeedMin), thresholds(trawlspeedMax, TrawlspeedMax), \+inRange(Speed, TrawlspeedMin, TrawlspeedMax)."
"A vessel initiates a communication gap, ending the condition trawlSpeed.","terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T)."
"A vessel stops being in a fishing area, ending the condition trawlSpeed.","terminatedAt(trawlSpeed(Vessel)=true, T):- happensAt(end(withinArea(Vessel, fishing)=true), T)."
"A vessel starts trawling movement, initiating the condition trawlingMovement.","initiatedAt(trawlingMovement(Vessel)=true , T):- happensAt(change_in_heading(Vessel), T), holdsAt(withinArea(Vessel, fishing)=true, T)."
"A vessel stops being in a fishing area, ending the condition trawlingMovement.","terminatedAt(trawlingMovement(Vessel)=true, T):- happensAt(end(withinArea(Vessel, fishing)=true), T)."
"A vessel starts trawling, initiating the condition trawling.","holdsFor(trawling(Vessel)=true, I):- holdsFor(trawlSpeed(Vessel)=true, It), holdsFor(trawlingMovement(Vessel)=true, Itc), intersect_all([It, Itc], I)."
"A vessel moves at SAR speed, initiating the condition sarSpeed.","initiatedAt(sarSpeed(Vessel)=true , T):- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(sarMinSpeed, SarMinSpeed), inRange(Speed,SarMinSpeed,inf)."
"A vessel stops moving at SAR speed, ending the condition sarSpeed.","terminatedAt(sarSpeed(Vessel)=true, T):- happensAt(velocity(Vessel, Speed, _, _), T), thresholds(sarMinSpeed, SarMinSpeed), inRange(Speed,0,SarMinSpeed)."
"A vessel initiates a communication gap, ending the condition sarSpeed.","terminatedAt(sarSpeed(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T)."
"A vessel changes heading, initiating the condition sarMovement.","initiatedAt(sarMovement(Vessel)=true, T):- happensAt(change_in_heading(Vessel), T)."
"A vessel changes speed, initiating the condition sarMovement.","initiatedAt(sarMovement(Vessel)=true , T):- happensAt(change_in_speed(Vessel), T)."
"A vessel initiates a communication gap, ending the condition sarMovement.","terminatedAt(sarMovement(Vessel)=true, T):- happensAt(start(gap(Vessel)=_Status), T)."
"A vessel performs SAR operations, initiating the condition inSAR.","holdsFor(inSAR(Vessel)=true, I):- holdsFor(sarSpeed(Vessel)=true, Iss), holdsFor(sarMovement(Vessel)=true, Isc), intersect_all([Iss, Isc], I)."
"A vessel loiters, initiating the condition loitering.","holdsFor(loitering(Vessel)=true, I) :- holdsFor(lowSpeed(Vessel)=true, Il), holdsFor(stopped(Vessel)=farFromPorts, Is), union_all([Il, Is], Ils), holdsFor(withinArea(Vessel, nearCoast)=true, Inc), holdsFor(anchoredOrMoored(Vessel)=true, Iam), relative_complement_all(Ils, [Inc,Iam], I)."
"Two vessels perform pilot operations, initiating the condition pilotOps.","holdsFor(pilotOps(Vessel1, Vessel2)=true, I) :- holdsFor(proximity(Vessel1, Vessel2)=true, Ip), holdsFor(lowSpeed(Vessel1)=true, Il1), holdsFor(lowSpeed(Vessel2)=true, Il2), holdsFor(stopped(Vessel1)=farFromPorts, Is1), holdsFor(stopped(Vessel2)=farFromPorts, Is2), union_all([Il1, Is1], I1b), union_all([Il2, Is2], I2b), intersect_all([I1b, I2b, Ip], Ii), Ii\=[]), holdsFor(withinArea(Vessel1, nearCoast)=true, Iw1), holdsFor(withinArea(Vessel2, nearCoast)=true, Iw2), relative_complement_all(Ii,[Iw1, Iw2], I)."