Spoke to the people at the contact number provided in the NOTAM and the details are as follows:
28 nm range from 51 52N 5 40W from a four hour period in the range 0800-1700 local daily from 5/7 to 8/7
320 nm range from 57 35N to 4 00W for a one hour period in the time ranges:
1600 - 1900 UTC on 7/7
0715 - 1015 UTC on 8/7
320 nm range from 55 55N to 5 50W for a one hour period in the time ranges:
1100 - 1400 UTC on 7/7
0715 - 1015 UTC on 8/7
The purpose it to test mobile GPS jammers.
Looks like I'll have to use that thing with the dials and needles again.....
