Duncan Idaho wrote:Really? I've never used an FMS either. But I thought it was a machine that was there to help you, can you not just load up an RNAV on the GPS
No. You cannot load up an RNAV or GPS approach because it does not exist in the database.
Duncan Idaho wrote: or tune up an ILS on the nav units?
Yes. Absolutely, one could do a ground based instrument approach such as NDB, VOR or ILS. However, if the airport is not in the database, they might not have any approach charts for that airport on the aircraft. So, that could complicate issues if you are trying to go to your alternate and organize acquiring the approach information such as frequencies, runway orientation and length, etc.
Eric Janson wrote:There may be an issue with the EGPWS terrain database where a terrain warning will be generated as it doesn't have the airport as part of the database.
That's a good point as well. It would add to the workload of the situation.
It isn't about being reliant on technology as much as it is about having the foresight to avoid overloading yourself in a potential situation. I'm sure there are procedures in place to deal with all of these incidences (not in database/no charts/EGPWS) but how many of those procedures do you want to do while also navigating to an unfamiliar airport in an unfamiliar country where English is a second language to the ATC (sometimes an issue, sometimes not). Workload could grow exponentially. But since none of us were there, it's all just guess work.