Four clicks is something I've only experienced from the military which announces "I AM SPEECHLESS".
Just to amplify, four short Tx (the letter H in morse code) is also used to request
HOMING (to an airfield) when used with the Speechless Code.
If you lose radio contact and are lost, you need to fly a triangle to the right if you can still receive, and to the left if you cannot receive. Supposedly ATC will notice this and will vector another aircraft to intercept you. Yeah right. I'd rather take my chances with 7600 ..........
Fine if your aircraft has a transponder. The "flying triangles procedure" dates back to the days when many military aircraft did not, and many military ATCUs were only equipped with primary radar. Bit of a last resort, but it has worked successfully in the past.
How many of you even have an up to date copy of CAP 412 any way!?
Not me, but I'm reasonably familiar with CAP 413
