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    Re: Dip Anomaly
    From: Robert Eno
    Date: 2008 Mar 13, 21:21 -0400
    I  used a marine sextant bubble attachment on Chesapeake Bay for a similar purpose. In my case, I was trying to calibrate the bubble attachment using the known dip correction for my height above sea level. I still have the raw data in my logbook.
    I do, however, agree with Peter that bubble sextants and bubble attachments are generally not precise enough to confidently determine dip anomalies, however, I believe it can, on occasion and with careful observation, be done.
    ----- Original Message -----
    From: Peter Fogg
    Sent: Thursday, March 13, 2008 6:50 PM
    Subject: [NavList 4666] Re: Dip Anomaly

    Greg Rudzinski asks:
    "Can a bubble sextant be used to measure dip
    anomalies from a known height of eye?"
    The proposition implies using both a conventional and bubble sextant consecutively and comparing the results.
    I guess one problem is that bubble sextants do not tend to give particularly precise results.  They are also notoriously difficult to use (to hold level) on-board. 
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