GLL:
(Virtual
$GPGLL,0000.000,S,14709.2858,E,024456.000,A*24<0X0 D><0X0A><0X0D><0X0A>
RMC:
(Virtual
$GPRMC,0000.0000,S,14709.2856,E,0.0,0.0,171017,,E* 57<0X0D><0X0A><0X0D><0X0A>
It did have "Control Checksum" checked.
Checked and unchecked makes no difference (After unchecking it, I closed and re-opened OpenCPN).
Edit: All other apps show latitude of 9° 27.9554 S