What symbol do you use for plotting gps position on chart?

[ QUOTE ]
The RYA YM course book gives any fix, visual or GPS as a dot with circle; ideally with time and log reading alongside.

[/ QUOTE ]

Long long time ago ... in the darkest hostiry of sail .... I was taught as a Deck cadet ...

a simple cross with no other surround except time marked next to it is : DR

Simple cross with triangle surrounding it + time = EP

Simple cross with circle surrounding it + time = visually observed position fix, ie compass bearings / horizontal sextant angles etc.

Simple cross with D surrounding it + time = Decca position

Simple cross with square surrounding it + time = electronic derived ... can include Decca ... Loran etc.

Simple cross with large L around it + time = Loran

Simple cross with square turned through 45 so on point + time = RDF ....

OK - I may have mixed odd one here ... l0ong time since I went to Nav school !! And to be honest most were not used by most nav's on ship .... the usual accepted matter being that the circle is not used for any except visually proven position fixes. Well it was on ships I sailed on !!

Now on my boat ? as long as I know and who-ever is with me knows what the mark is - then that's what matters.
 
in those days it very much depended on which nav school you went to, which company you worked for and what the captain on each ship wanted to see on the chart. some shipping companies required the voyage charts to be sent to head office on completion of the voyage so they could be scrutinised by the 'suits' ashore, so the symbology was important

however, if we accept the r.n. navigation symbols as being the gold standard, wot I wrote is their way of representing a gps fix, thus - more than likely, the accepted correct way. /forums/images/graemlins/cool.gif
 
[ QUOTE ]
The RYA YM course book gives any fix, visual or GPS as a dot with circle; ideally with time and log reading alongside.

[/ QUOTE ]

a dot is used to determine the navigators chosen position when a cocked hat occurs, a circle is then drawn around the dot and a time put next to it.
if three or more position lines coincide, a circle with a time denotes the position...........the dot is irrelevant.

dont accept the rya is infallable /forums/images/graemlins/smile.gif
 
[ QUOTE ]
a simple cross with no other surround except time marked next to it is : DR


[/ QUOTE ]

a dr has to be on the course line (track) laid down, and is made by simply making a line through the track, and adding a time. thus its not really a stand alone cross.
 
true ...

silly me to assume nav hasn't drawn a course line !!

/forums/images/graemlins/wink.gif
 
I knew what you meant nigel ........ I'm just a little bit bored today so working on my 'posting tally' - nearly 5k huh /forums/images/graemlins/smile.gif
 
as you understand the question and the lakesailoring rules, how about you adjudicating on my claim to be lakesailored earlier in the thread /forums/images/graemlins/cool.gif
 
'Infallable' - never!

Its interesting that Mary Blewitt somehow managed to write the finest 80 pages ever on practical navigation without describing any symbols at all.... /forums/images/graemlins/smile.gif
 
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