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SELCAL is the key factor ensuring Ground-to-Air traffic is handled in a timely manner.
When not in conflict with ATC requirements, flight Crews are encouraged to maintain SELCAL guard with STO Radio at all times on a suitable frequency while operating in our Service Area.
The frequency to guard depends upon time of year, time of day and aircraft position. Our Propagation Forecast will offer crews a rough guideline for selecting the best frequency. Better still is actual experience and pilots are encouraged and welcome to call us as often as you like just to check it out.
Please, bear in mind that the frequency you checked your SELCAL on early in the flight may not be the best frequency for the latter part of a long haul flight as distance and time differences affect the optimal frequency.
N.B. when En Route - with dual HF installations - it is recommended to select two different frequencies on the two HF sets for SELCAL guard, to overcome the changes in the propagation that may occur as time and location change.
