Here is a link that shows which games will be broadcasted on FSNNW HD which is almost all of them.
Just looked in the guide and it shows the Mariners game today on 651-1. Going to be sweet!
All Mariners home and away games will be shown in HD on FSNNW HD (651-1), with the exception of games that will be on National TV (FOX, ESPN, etc.).
We finally get to exercise this channel now that baseball is here.