by Michael Bryant » Wed Mar 08, 2017 4:50 pm
I am not familiar with the Northstar GPS, but I do know that my Garmin GNC300XL will work fine without a database update (I have forgotten to download update for a few mostly local VFR flights). However, there is no guarantee the position of waypoints in the database will match their current accepted position. We fly IFR so we generally keep the database up to date (see below).
According to the AIM there is no requirement that GPS databases be current for VFR flight. It is recommended that you verify waypoints you use for navigation. Though not explicitly spelled out, to me this means crosscheck the Lat/Long of every point you use for navigation; e.g. VORs, intersections, waypoints, etc. This could be quite the task for a long flight or in the event of a reroute. It also means that any stored data such as frequencies, runways, runway data such as length and width, airport elevation, etc. should be verified.
It is a requirement that the database be current for IFR operations. To me, this means only using the outdated GPS database for positional awareness and no navigation that cannot be backed up with other sources on board (VOR, NDB, ILS).