Expanding Parallel Line Pattern

This pattern is used for searching for a casualty that is drifting fast - very often at the mouth of a river.  It can only be used if you use a previously calculated Datum position as we need to know the LKP position as the Arc Angle is calculated from the LKP.

•A : The DATUM or START position must come from

opreviously calculated Datum positions - when you click on the circle to the left of "Calculated Coordinate" a list of the last calculated Datum positions is displayed and you can select the one you need by clicking on it.  In this case the LKP position related to the Datum is displayed

•B : Distance from Datum : normally a Expanding Parallel Line search is started up-drift of the Datum position, and so the default value of zero needs to be changed to a negative number.  If you want to

ostart closer to the LKP position (up-drift) then enter a negative number of nautical miles

ostart down-drift of the Datum position then enter a positive number of nautical miles

•C : The drift bearing which will guide the bearing of the pattern.   

othe drift bearing from that calculation will be displayed

•D : The speed the rescue vessel will average during the pattern execution

•E : Search Minutes : the time allocated to the search pattern is NOT used.  29 legs will be calculated, and if you want to limit the number of legs that are sent to the rescue vessel, you must set the value in the "Use" column to a blank for those legs that should be excluded

•F : Leg Distance is not used with the Expanding Parallel line as the distance of each leg will change the further away the leg is from the LKP position

•G : The track spacing - this is compulsory for the Expanding Parallel Line pattern

•H : Arc Angle - this is compulsory for the Expanding Parallel Line pattern

•I : clicking on this "Calculate" button will calculate the search patterns using the information in the header

•J : click on the circle next to the work "Expanding Parallel" to display the information if it is possible to do so

•K : the details of each leg of the pattern

oUse - this column contains "y" by default and it means that the leg will be included in the GPX file that is created and sent to the vessel (see Multi-vessel searches)

oLeg - the leg number

oDist - the distance of the leg in nm

oBear - the bearing of the leg from leg start point to leg end point

oMins - the number of minutes the leg will take to complete given the rescue vessel speed

oTot Mins - the total number to minutes that will have been used to get to the end point of the leg

oDD Coords - the coordinates of the turning point in Decimal Degrees

oDDM Coords - the coordinate of the turning point in Degrees and Decimal Minutes 

•L : Use All - clicking on this will change the value in the "Use" column.  The default is that all the values in this column = "y", and if the "Use All" check box is clicked and the "y" values will be replaced with blank values.  If the values are currently blank, they will be replaced with "y" when the check box is clicked. (for more details see Multi-vessel searches)

•M : Total Stats : this section shows the total statistics for the entire calculated pattern

oThe number of minutes it will take for the entire pattern to be executed given the average speed of the vessel

oThe time it will take in hours and minutes

oThe distance traveled for the entire pattern

oThe area covered by the search pattern

•N : Click on this GPX button to create a GPX file that will include the selected legs of the pattern 

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