WSJT-X/grid2deg.f

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subroutine grid2deg(grid,dlong,dlat)
C Converts Maidenhead grid locator to degrees of West longitude
C and North latitude.
character*6 grid
character*1 g1,g2,g3,g4,g5,g6
if(grid(5:5).eq.' ') grid(5:6)='mm'
g1=grid(1:1)
g2=grid(2:2)
g3=grid(3:3)
g4=grid(4:4)
g5=grid(5:5)
g6=grid(6:6)
nlong = 180 - 20*(ichar(g1)-ichar('A'))
n20d = 2*(ichar(g3)-ichar('0'))
xminlong = 5*(ichar(g5)-ichar('a')+0.5)
dlong = nlong - n20d - xminlong/60.0
c print*,nlong,n20d,xminlong,dlong
nlat = -90+10*(ichar(g2)-ichar('A')) + ichar(g4)-ichar('0')
xminlat = 2.5*(ichar(g6)-ichar('a')+0.5)
dlat = nlat + xminlat/60.0
c print*,nlat,xminlat,dlat
return
end