Theoretically, yes - WAAS uses a series of ground stations with known fixed
locations to
refine the error present in the clock signals coming from the GPS satellite
network.

--- In garmin_forerunner_305@..., "dongoldstein2005"
<dongoldstein2005@...> wrote:
>
> My understanding is that the Forerunner 405 is WAAS enabled and the 305
> isn't. Does that mean that the 405's GPS is more accurate than the
> 305's?
>