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    Re: Polhemus computer
    From: Gary LaPook
    Date: 2017 Aug 6, 20:38 +0000
    Nope, that's volume 2 and 3 of HO 249. HO 229 has six volumes, each covering 15 degrees of latitude, e.g. 0-15, 15-30, etc.


    From: John Blake <NoReply_JohnBlake@fer3.com>
    To: garylapook---.net
    Sent: Sunday, August 6, 2017 1:15 PM
    Subject: [NavList] Re: Polhemus computer

    One volume of HO229 is for latitudes 0-45 degrees and the other is for latitudes 46-90. If we were on a training mission where we knew that we would not be going north of 45, we only carried one. For operational missions (airborne alert), we carried both.

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