JRC-850 Sounder to Cmap laptop

[Rubes]

I have an old japan radio company sounder with gps input and a laptop with cmap installed. Currently able to send NMEA data to laptop via usb to serial cable. using hyperterminal I am able to get the following nmea output strings from the com port.
$SDGLL,4253.21,S,14719.76,E,,
$SDVTG,327,T,313,M,01.1,N,,
$SDBWC,003355,4259.91,S,14723.22,E,,,145,M,007.1,N ,0000
$SDRMB,A,2.53,L,0000,0000,4259.91,S,14723.22,E,007 .15,159,-01.0,V*12
$SDDBT,0013.4,f,0004.1,M,002.2,F
$SDMTW,14.5,C,58.1,F
$SDVHW,327,T,313,M,00.0,N,,
$SDAPB,A,A,2.53,L,N,V,,346,M,0000,145,M,,
$SDAPA,A,A,2.53,L,N,V,,346,M,0000
$SDRMC,003355,A,4253.21,S,14719.76,E,01.1,327,2308 89,14,E*68

Have tried setting cmaps config.exe - "nmea config tab" to gps-com4-RMC and numerous other different combinations but on opening cmap no lat/long is displayed, if I unplug com port then try to open cmap says unable to open port so cmap is seeing the port and I know the data in above format is being input to com port (com port settings are correct ie baud at 4800,8,1 etc). Ready to jump overboard, any help greatly appreciated.
Regards
Rubes

[motion30]

Rubes , DON'T JUMP