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    Re: H.O. 249: rounding Ho
    From: Michael Jones
    Date: 2020 Mar 19, 21:26 -0700

    HO-249 was designed for use in aircraft navigation, and the bubble sextants used only read to one or two minutes. Their fixes were accurate to around 5 miles, and didn't need to be more precise as they could see a long way at altitude. Once the aircraft got within 20 - 50 miles they could rely on radionavigation.

    There was a thread here about significant digits that might help answer this also.

       
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