[Myrddin]

The Russians did sell GPS jammers. They weren't very effective because they were terrestrial transmitters. The signal is a "line of sight" transmission. To be an effective jammer, you need to make it airborne so the "line of sight" to the satellites weak signal is overcome by a much closer, stronger and visible alternative.

I don't think there are "jammers for jammers". More likely is a homing device for a missile that locks onto a GPS signal jammer as a target. If you hope to effectively jam, you must be "heard" by the receivers you intend to jam. That means you can be "heard" by a homing device too.

[jerseygirl]

Intriguing info! Myrddin- I feel embarrassed posting some of my thoughts as obviously I have NO military experience at all.

(But I can cook a great pot of Chili!)