Skip to content


A-11 Navigation (Hack) Watch Manual

Below are scans from the original War Department publication AN 05-35A-8, Handbook of Instructions with Parts Catalog for Navigation (Hack) Watch, 10 April 1945, a joint publication of the USAAF, USN, and RAF.

It contains instruction for the care and maintenance of the Waltham A-11 wristwatch issued for air navigation and includes complete servicing and adjustment instructions.

It’s interesting to see that the accuracy tolerance was a mere +/- 30 seconds in two positions, which starts to make on realize exactly how accurate modern watches are.

Click on the images below for a larger view.

waltham-A-11-maunal-01

waltham-A-11-maunal-02

waltham-A-11-maunal-03

waltham-A-11-maunal-04

waltham-A-11-maunal-05

waltham-A-11-maunal-06

waltham-A-11-maunal-07

waltham-A-11-maunal-08

waltham-A-11-maunal-09

waltham-A-11-maunal-10

waltham-A-11-maunal-11

waltham-A-11-maunal-12

waltham-A-11-maunal-13

waltham-A-11-maunal-14

waltham-A-11-maunal-15

waltham-A-11-maunal-16

waltham-A-11-maunal-17

waltham-A-11-maunal-18

waltham-A-11-maunal-19


3 Responses

Stay in touch with the conversation, subscribe to the RSS feed for comments on this post.

Continuing the Discussion

  1. Waltham A-11 Navigation (Hack) Watch Manual – I Already Have a Watch. linked to this post on 30 November 2009

    […] A-11 Navigation (Hack) Watch Manual […]

  2. Waltham A-11 Navigation (Hack) Watch Manual – I Already Have a Watch. linked to this post on 30 November 2009

    […] A-11 Navigation (Hack) Watch Manual […]

  3. US WWI A-11 a pilot watch? linked to this post on 04 June 2019

    […] is a good history of ithttps://forums.watchuseek.com/f7/wri…on-207560.html and also A-11 Navigation (Hack) Watch Manual ? I Already Have a Watch. Always give a word or a sign of salute when meeting or passing a friend, even a stranger, […]



Some HTML is OK

or, reply to this post via trackback.