How about this:

RMC_array[48]=","
RMC_array[49]= Heading DIG 2 + "0"
RMC_array[50]= Heading DIG 1 + "0"
RMC_array[51]= Heading DIG 0 + "0"
RMC_array[52]= "."
RMC_array[53]= "0"
RMC_array[54]=","