Select your product to confirm this information applies to you
DC 40 accuracy and tracking ability due to GPS receiver location
A DC 40 collar's accuracy and tracking ability will be effected if it loses GPS reception. This is the case with the DC 20 and DC 30 collars, as well.
The DC 40 will perform well in most of the same environments as the DC 20 and DC 30. However, if the DC 40 is completely submerged, you will then lose GPS reception.