The resulting position accuracy depends on satellite geometry.
The increase in error arising from non-ideal S/V geometry is called Geometric Dilution of Precision (GDOP).
HDOP and VDOP refers to the horizontal and vertical error factor, respectively.
VDOP is usually highest as most satellites are near the horizon.
These are generally reported somewhere on your GPS satellite info pages.
Potential accuracy of C/A code position ends up ~30m.