Cheers Hempy - apologies, you did mention it before from an ATC perspective.
From a piloting perspective, 15º is optimal. Negligible difference in time or fuel to climb, or time or fuel for the trip.
Combine that with an awareness of which runway is in use, and that will be the decider for 15º 'left' or 'right' of the departure radial.
There will always be a navaid at the aerodrome for turbojet departures (CAO 82.5). Just one aircraft tracking 15º off works well with a VOR. Places like YBRM, YAYE etc only have NDB (hence V112 tracking inbound to AYE) so you need one plane to do 30º, or both agreeing to 15º.
It would be *nice* if all the other guys we shared airspace with, understood that if I/we ask for them to offset 15º, we
both win.
Dog One... it is easier to do separation OCTA once you learn the tricks of the trade
