why RAIM expected at this time of day for NPA not DEPARTURE SID?
Because RAIM (predictive) is used to assess signal availability along a route in the coming hours. In other words, can I plan to fly this route and approach at the times I’m expecting to cross and area / arrive at a specific airport. If you’re on ground and there is no signal availability you have the option to use non gps based departure or cancel flight.
CP