Change HDOP in SITL 4.1.0

I’m working towards developing a GUI telemtry app for Android and would like to use the SITL running Arducopter 4.1.0 for bench testing and, eventually, training purposes. However, the HDOP in SITL is stuck at 1.15 and nothing I do (change num_sats, gps_acc) seems to affect it. I need it lower for a preflight check to pass in the GUI. Is there some way that I can affect this number in SITL?