For a 2 VOR comparison check: +/- 4° Airborne geographic location check: +/- 6° VOR checkpoint: +/- 4° of the posted radial. DME should be within 0.5 of the posted distance.
What are the weather requirements for an airport, with no authorized IAP, being used as an alternate?
The forecast for the projected ETA must indicate that the ceiling and visibility will be at least 500 feet above the minimum IFR altitude that will permit a VFR approach and [...]
If there is an altimeter error of more than 50 feet while on the ground, you have a problem. To check the accuracy, apply the present altimeter setting to the altimeter [...]