Notam h1858/17 - up to 8 hel flying in formation will transit between the following
points:
510520n 0040916w (chivenor ad) etd 1845
511346n 0015727w (salisbury plain) eta 1945
511346n 0015727w (salisbury plain) etd 2315
511848n 0020641w (keevil ad) eta 0015
transit height 500-1000ft agl. Timings, hgt and route are aprx and
may change due to wx or other requirements. For info 07429099324 or
rtf ctc 122.750mhz. 2017-04-0364/as4. Sfc - 2000ft amsl, 28 apr 18:45 2017 until 29 apr 00:15 2017.