Originally Posted by JonWhitehouse
Is there any relevence to the use of FM-immune equipment in class G airspace?
Yes.
If the MSA has to be calculated on a ceratin distance from the aircraft position, the ability to determine that position and how accurate the information obtained from various systems has an effect on the MSA calculated.
eg. DR position......one could have to use 1000ft above all obstacles within some 60 to 120nm from the aircraft depending on how long since last fix.
Using serviceable operating VOR equipment, I believe that the error is +/- 5deg. Thus at 60nm one will be +/- 5nm from the indicated radial.
ADF not as accurate, VDF, they tell you the accuracy with the bearing.
Thus what system is used and the servicability of that system as a great bearing on the MSA. A lower MSA reduces the probability of a diversion.
Regards,
DFC