Does anyone remember?

[j.sabourn]

The log line measures the distance steamed through the water and not over the land , so is used as a DR not a Decline to Report but a dead reckoning position. If you are like the media and add your own bits of knowledge to this , you will with the second mate allowing and having one of Ivan’s special 2B pencils be allowed to put a little triangle on the chart and say betcha we’re here. However all will be revealed by a much closer nearer to the truth revelation when the sun reaches its highest altitude and you shoot it and it flutters down to the deck where you are at least able to wring it’s neck and find your latitude from. Then will see how much your little triangle was out of position. JS

[j.sabourn]

#31. John the 2 Different type of charts found on ships when you were going to sea , and before electronic charts were the Mercator Projection and The Gnonomic projection . I have no doubt both will be explained on google ,For normal use every day the Mercator charts were the most widely used and the only time ever used the Gnomonic chart was to check for courses on Great Circle sailings .There are of course other projections for plans of ports etc.
If you were doing a Great Circle from Liverpool to New York it would show as a straight line on the chart and you would have to measure the courses with a protractor as the angle that the course line crosses each meridian which shows them in their true perspective. Far easier for you to look up and see if better description on google than I can explain on here. Anyhow it proves the distance between 2 points is a straight line , on a gnomonic chart , not so on a Mercator chart however as is a different projection and would show as the closest to an arc as possible. JS