The problem with waas is the fact it is a ongoing project by the feds.Waas satellites orbit around the equator and there not but a small number of them.being in a equator orbit it is hard to keep a lock because of land objects blocking the signalThey are set up for craft being airborne or in the open ocean where signal does not get blocked.my unit has waas,bought it hoping the feds keep improving the system until everyone can benifit from it.