To hopefully illustrate the point being debated this si what you get for Gatwick for example:
Augur NPA RAIM prediction
Scenario Information
Scenario Start UTC 26/07/2007 23:00:00
Scenario End UTC 29/07/2007 23:00:00
Receiver Mask Angle 5.00
Scenario Almanac Week: 413 TOA: 589824
Active NANUs 2007078
Request Time UTC 27/07/2007 10:05:17
Gatwick (EGKK)
Baro Aided Outages
No RAIM Outages
Non Baro Aided Outages
27/07/2007 07:01:30 until 27/07/2007 07:12:30
27/07/2007 10:39:30 until 27/07/2007 10:45:30
28/07/2007 06:56:30 until 28/07/2007 07:07:30
28/07/2007 10:34:30 until 28/07/2007 10:41:30
29/07/2007 06:52:30 until 29/07/2007 07:03:30
29/07/2007 10:30:30 until 29/07/2007 10:37:30