NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: DR plotting techniques
From: Doug Royer
Date: 2003 Oct 17, 11:38 -0700
From: Doug Royer
Date: 2003 Oct 17, 11:38 -0700
Stacy,thanks for the info about the websites.That's real good info.By the way,you mentioned you were in the Navy so I figured you guys correct your charts.Do you guys still use the DR plotting(maybe they were called DR positioning)machines.I've seen them(there are pictures of them in the old Dutton books)but don't really know how they work. -----Original Message----- From: Stacy Hanna [mailto:jshanna@BELLSOUTH.NET] Sent: Friday, October 17, 2003 11:20 To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Re: DR plotting techniques Actually getting the corrections off of the web is easier than ever. For US notice to mariners the website is http://pollux.nss.nima.mil/index/index.html and for British Admiralty notices use http://www.nmwebsearch.com/ . The US website is currently down while they work on it but will probably be back up later this afternoon. Both websites let you search for corrections by chartnumber so you only have to pull up the ones you actually need. -----Original Message----- From: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM] On Behalf Of Rodney Myrvaagnes Sent: Friday, October 17, 2003 14:46 To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Re: DR plotting techniques I did not discuss this point, but perhaps should have. From about 1984 to the mid 1990s, we faithfully updated charts from printouts generated by the Automated Notice to Mariners system of the US Hydrographic Office. This was relatively easy because it was a text-based direct-dial modem (or SSB for those at sea) and I could write a script that I could start with a keystroke and ignore while it took down corrections sorted by chart number. Before that we used the paper Local Notices. These were not as convenient, because each correction was printed once, with a list of chart numbers following. SInce the world-wide web became universal, just getting the updates is a manual hassle. I have been much sloppier. We have gotten away with this because of the GPS, which lets us identify renumbered ATONs by location. If anyone knows a way to automate the current system, I hope s/he will post it. Rodney Myrvaagnes J36 Opinionated old geezer Eagles may soar, but weasels don't get sucked into jet engines.