Increasing the range of the Skyviper V2450 GPS?

I have seen some discussion here about increasing its range by making the GeoFence value higher and also turning off the Radio Range Safety feature. I have tried making the Geo Fence Limit higher in the flight calibrations but it resets itself to the default 100 (m?). I am not looking for anything crazy distance wise considering the limited battery, but I would like to try and stretch my mission out to about double the size of the current Geo Fence. Any specific suggestions on how to do it safely?