Not essential but makes negotiating the Thames Estuary a lot easier, but still can run out of water because the banks keep moving quicker than HM HYDROGRAPHERS can plot them, and they are not plotting for us "tiddlers"
Back in the 70's before the advent of gps i used to use one of those hand bearing electronic null instuments where you had to type in the r/f of a local beacon. The only time i used it in anger was in the fog to the south of Guernsey where we tried to locate the beacon on the airport and tried to triangulate 2 other signals. One of the crew shouted 'look there's a basking shark'. When we went over to have a look it was the rocks! Dont remember what happened to this supperb piece of rubbish.
Used an RDF in the 80s too! They did work, but it was possible to be right and wrong by 180 degrees which could just be a problem if you were very lost and the beacon was on an Island?
Quiz - who famously sold an RDF product but went way off course himself.
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a lot was an almost inbuilt navigation feeling, I have a book somewhere that explores this, and I know from personal experience that you do get a "feel" for things, I nearly almost alway manage to be tie up safe before bad weather hit /forums/images/graemlins/grin.gif
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Like when we ended up in Brighton Julie? /forums/images/graemlins/smile.gif
well we did get in, and tied up safe before the wind was so strong that she was leaning over the pontoon, and we decided that to try and move her then to another berth was down right stupid. /forums/images/graemlins/grin.gif