Adding Nav.3 to the [RADIOS] section causes the morse code for NAV 1 to stop working for all planes until you restart the sim. The CJ4 the 747 and A320 all have 4 navs entry's but they use a HTML FMC code and not Lvars. So they can get away with it. So we need to fix this as you can have up to 4 nav entry's according to the SDK.
Nav.3 = 1, 1, 1