Here is link to a site that has current info, or links to current info, for all WAAS satellites:

http://gpsinformation.net/exe/waas.html

Links to visibility from your location are at bottom of page. Select the WAAS satellite you want then click near your location on map to see visibility info.

The new WAAS constellation is a looser for folks in eastern US and Canada. AOR-W (PRN 122) has dropped from 38 degrees elevation to 11 degrees elevation for central PA location, it will be lower in Ontario. The new WAAS satellite (PRN 135) is at 17 degrees elevation for central PA location. If you are using AOR-W you will probably need to reduce your elevation mask to about 5 degrees, even then you will drop WAAS corrections for short periods of time when operating on rolling terrain.