on power up, the IRS obtains position
- latitude from previous position
- longitude from previous position
- latitude and longitude from previous position
Explanation from PART66Online
On power-up the inertial reference system can recover latitude from its last stored position because latitude is needed for the gyrocompass alignment that levels and aligns the platform. Longitude, however, must normally be entered by the crew, so only the latitude is taken from the previous position.
G
Gibbo280490 asked · 7 Apr 2014
I have read many conflicting answers on the net and i thought i came to the decision it was LAT, any explanations?
Community Comments (2)
M
MridulDev
11 Mar 2016
from what i read, IRS can't calculate local longitude, and hence it is obvious that it'll take the local longitude from previous location while it'll try to acquire local latitude. Correct/ comment me if I'm wrong.
J
Jordi
9 Apr 2021
IRS=obtains from the longitude of the previous position
INS=obtains from the latitude of the previous position.
INS=obtains from the latitude of the previous position.
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