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radial element

Attribute	Format	Remarks
Element	radial
trk	integer	inbound track value (0-360)
rad	integer	outbound radial value (0-360)
len	float	length of radial to draw (in nautical miles)
offset	float	offset distance in nm - start radial line from point this point
stipple	integer	stipple line bitwise pattern definition
width	float	line width
color	string	color id name
r	byte	color RGB value (0-255)
g	byte	color RGB value (0-255)
b	byte	color RGB value (0-255)

The <radial> element can contain one or more <marker> sub elements:

Attribute	Format	Remarks
Element	marker
int	integer	interval value at which to draw this marker
offset_cw	float	length in nautical miles of the marker to draw on the clock wise side
offset_ccw	float	length in nautical miles of the marker to draw on the counter clock wise side
skip	integer	skip x markers before starting to draw first marker
number	integer	draw only x number of markers
stipple	integer	stipple line bitwise pattern definition
width	float	line width
color	string	color id name
r	byte	color RGB value (0-255)
g	byte	color RGB value (0-255)
b	byte	color RGB value (0-255)

Each radial requires 1 <point> element which corresponds to the start of the radial. The <marker> elements are optional.

Use a radial element to draw ILS runway extension lines

example

<!-- ILS EBOS RWY 26 -->
<radial trk="259" len="20"color="ILS">
    <point lat="N0511147872" lon="E0025109331"/>
    <marker int="1"  offset_cw="0.5" offset_ccw="0.5"/>
    <marker int="5"  offset_cw="1.0" offset_ccw="1.0"/>
    <marker int="10" offset_cw="1.0" offset_ccw="1.0"/>
</radial>
<!-- ILS EBOS RWY 08 -->
<radial trk="079" len="10" color="ILS">
    <point lat="N0511211970" lon="E0025349610"/>
    <marker int="1" offset_cw="0.5" offset_ccw="0"/>
    <marker int="5" offset_cw="1.0" offset_ccw="0"/>			
</radial>

example using offset, skip and number attributes …

Smart usage of the <radial> element combined with several <marker> elements can result in complex radial drawings such as runway extension lines with different markers depending on the distance from the threshold:

<!-- runway extension line, stippled, 25 NM long -->
<radial rad="079" len="25" width="1" offset="10" stipple="52428" color="ils">

    <!-- starting point -->
    <point lat="N0511211970" lon="E0025349610"/>
    
    <!-- draw 2 markers every 5 NM, skip first 3, counterclockwise 0.5 NM long, clockwise 0.5 NM long -->
    <marker int="5" offset_ccw="0.5" offset_cw="0.5" skip="3" number="2"/>
    
</radial>


<!-- rwy extension line, 10 NM long, drawn on top of the first 10 NM of the previous stipple line -->
<radial rad="079" len="10" width="1" offset="1" color="ils">

    <!-- starting point = equal to the starting point of the previous stipple line -->
    <point lat="N0511211970" lon="E0025349610"/>
    
    <!-- draw a marker every NM but skip first 2, only clockwise 0.25 NM long -->
    <marker int="1" offset_ccw="0" offset_cw="0.25" skip="2"/>
    
    <!--  draw a marker every 2 NM but skip the first one, clockwise 0.5 NM long -->
    <marker int="2" offset_ccw="0" offset_cw="0.5" skip="1"/>
    
    <!-- draw a marker every 5 NM but skip the first one, clockwise and counterclockwise 0.5 NM long -->
    <marker int="5" offset_ccw="0.5" offset_cw="0.5" skip="1"/>
    
</radial>

The radial line starts with an offset of 1nm from the runway threshold, the first two 1nm markers are skipped, and the first 2nm and 5nm markers are also skipped.