On the other hand, it's perhaps so modest that it does raise some sovereignty protection implications, which the committee might like to address. In terms of possible measures we could take, I'll run through these very fast: additional land, sea, and air deployments from southern Canada; improved multi-agency data sharing and analysis; the creation of a modest, and I stress modest, northern training centre; the retention and upgrading of the Arcturus, Arctic sovereignty aircraft, or what was nominally supposed to be an Arctic sovereignty aircraft but is now scheduled to be disposed of; acquire a supplement to the Twin Otter aircraft currently stationed in Yellowknife; acquire and we're looking at naval options an ice-capable seabed ope ...[+++]rations vessel; explore a full range of space-based sensors, unmanned aerial vehicles, and subsurface surveillance systems, northern terrain vehicles; explore the utility of high-frequency surface wave radar in the north I believe Dr. Leggatt spoke to you about that and acknowledged that it had some potential utility, but there were limitations; and, in the longer term, continue to explore the potential for installing air-independent propulsion power plants on the four recently acquired submarines.

22. Calls on the Council to ensure that technical equipment used to secure external borders will in future be interoperable and to take steps to pave the way for joint procurement of mobile surveillance apparatus (radar and satellite monitoring);

The United States Air Force AWACS provides a significant improvement over ground-based radar stations, and extends the perimeter radar system in times of increased alert.

There was the distant early warning line of radars across the top of the continent, there was the mid-Canada line across the middle of Canada, and there were several layers of radar in southern Canada and around the perimeter of the continental United States.

This is perimeter warning — a perimeter radar system, if you want — whose sole responsibility is to look out.