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    Hybrid Artificial Horizon - another option
    From: Paul Saffo
    Date: 2008 Sep 17, 15:04 -0700

    I have had a similar issue, and in the end settled on using a
    surveyor's tribrach with a glass plate attached to a Seco adaptor
    plate. The tribrachs level out quickly: most even have a built-in
    bubble level to do the rough leveling -- then I fine-tune level with a
    30" bubble atop the glass. One can purchase tribrachs on eBay for
    under $50, so you could even pre-position two or three of them all
    leveled out and then simply drop in the Seco adaptor and plate into
    different tribrachs as you moved around. (If anyone would like to see
    pice of the tribrach set-up, email me and I will sent you a shot)
    
    Definitely not as convenient as a self-leveling system, but I could
    never figure out how to get a true level from a floating body and
    can't stand fussing with even something as simple as the Davis water-
    filled artificial horizon.
    -p
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