The repeater compass in RL is just that, a repeater of the main gyro compass, as you already knew, i assume.
In il2 its, afaik, the same, a indicator for the main gyro compass, indicating north in relation to the planes axis.
The radio compass, as you've already written, points toward the choosen NDB or Radio Station.
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Win 7/64 Ult.; Phenom II X6 1100T; ASUS Crosshair IV; 16 GB DDR3/1600 Corsair; ASUS EAH6950/2GB; Logitech G940 & the usual suspects

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