Finding the missing legacy acquisition records
The targeted public search did not obtain a manual or calibration record matching the six recordings' V5 firmware/ICD combinations: 04.50/14.00, 05.00/17.00 and 05.20/18.00. This is a bounded search result, not proof that records do not exist.
The NASA-hosted Applanix directory lists only a V6 manual and V6 ICD. Other hits concerned marine systems, newer firmware or bibliographic references without the actual legacy manual. None was substituted into the decoder or calibration assumptions. The search log preserves the 19 queries and main access-route outcomes for a future session.
The current ILVIS0 user guide describes the Level-0 archive as raw, unprocessed data, with no product derivation algorithms or processing steps. It includes IMU/GPS supporting measurements and was updated in August 2025. This supports archive-level provenance. It does not specify calibration, filtering or Earth-rate compensation inside Applanix before logging, nor the legacy Group-4 encoding, integration period or latency.
NSIDC lists nsidc@nsidc.org for user services. The ready-to-send request names the DOI and exact firmware combinations, asks three essential questions and requests routing to the acquisition team if needed. Official contact page
The six-file inventory and full questions provide follow-up detail. No original data or credentials need to accompany the initial request. No message was sent. This workspace has no email-sending tool configured.
Useful responses would establish the firmware-matched Group-4 logging tap relative to navigation corrections, encoding/clock conventions, and installation/calibration bounds. Responses must be checked against the listed configurations. General navigation accuracy alone would leave those questions open.
All 232 originals and earlier frozen studies remain intact. No empirical Earth fit/start or scientific gate change occurred. Obtaining the matched records is the next step; repeated public searches or noiseless controls cannot supply them.