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    Re: What precision is required in cel nav?
    From: Francis Upchurch
    Date: 2015 Jul 17, 23:28 -0700

    John,

    You asked about line of sight nav aids for boats.

    On a clear night I often get a bearing from a lighthouse 20 miles or so away.

    In the 80's we had RDF, pretty inaccurate "cocked hat" to about 5 miles, but all the beacons closed down late 90's I think after Decca, Loran and then GPS arrived.

    Last year I put new batteries in my old RDF and discovered that some small "local" airports still broadcast NDB signals for aviation approach navigation.

    I managed to get a few resonable fixes from my garden and intend to try at sea in a few weeks.

    No idea how long these NDBs will stay operational. I think they do not re[place them when they break down!

    Last year I could find Ireland via Radio RTE channel 1  still broadcasting on 252 Khz, but that closed down in October! (the RDF only covers about 250-550 Khz)

    Oh well.

    Francis

       
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