From an article on the BBC's website:

UK-led Exercise Joint Warrior to be 'biggest ever'

 

...Earlier this month, the Royal Navy said jamming will be limited to a confined area in the north-west of Scotland.

It said the relevant authorities, including aviation and maritime communities, had been consulted.

The Mountaineering Council of Scotland was this week alerting walkers and climbers to the potential disruption to GPS devices they might use in addition to a map and compass.

Jamming during Joint Warrior in October 2011 was suspended after complaints from Western Isles fishermen.

The latest war games come just weeks after a fisherman claimed a submarine may have snagged itself on his trawler as it fished off the Western Isles, an area were elements of Joint Warrior's training are held.

Angus Macleod said he and his four crew were "extremely lucky" after his net was continually dragged in front of his 62ft boat.

http://www.bbc.com/news/uk-scotland-highlands-islands-32252012

-Sean C.