Dead reckoning needed probably because they lost vacuum and gyro power to instruments, which then spin down and float randomly if there’s no battery backup
Inertial Navigation System... a mechanical system which maintains position by double integrating acceleration, which means infinitesimal errors grow to dominate over time, and so need to be recalibrated often.
a, v0 maybe vectors; x maybe a point insead of a number
x(t) = a(t)*t^2 + v0*t + x0
Modern human-portable INSes for adventuring/surveying use laser ring gyros, and GPS when available.
Inertial Navigation System... a mechanical system which maintains position by double integrating acceleration, which means infinitesimal errors grow to dominate over time, and so need to be recalibrated often.
Modern human-portable INSes for adventuring/surveying use laser ring gyros, and GPS when available.