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    Re: Can You Bias Ho?
    From: Peter Monta
    Date: 2014 Apr 2, 13:39 -0700
    Hi Brad,

    I think in actual use it would look like the attached drawing.  It seems a reasonably comfortable position for the sextant.

    Small pentaprisms can be had for pretty cheap from places like Surplus Shed (e.g. a 14 mm prism for $10; link below) or eBay.  Any deviation error from 90 degrees can be treated like an index error and measured in situ.

    http://www.surplusshed.com/pages/item/l13726.html

    By the way, here's a better link to Nicolàs de Hilster's page on the pentaprism attachment.  A full set of photos and drawings.  Nice!

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