A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2017 Apr 5, 13:47 -0700
John Howard you wrote : I do not think WAAS is full time for everywhere.
There are various systems world wide. WAAS is the US one. Together they cover quite a bit of the Earth. It's all explained rather well here http://www.sxbluegps.com/technology/sbas-made-easy/ with a rather nice coverage chart towards the bottom and a little bit about lower spec receivers at the very bottom. DaveP