Loran-C numbers to GPS ????

[The Broken One]

does anyone out there have the formula or charts to convert given Loran numbers to GPS numbers 

[CapBob]

Tom

I found this:

Andren Software makes a program called LoranGPS:

"The LoranGPS program is a tool for fishermen and divers to
 manage collections of Loran or GPS readings and print an
 organized book of listings and maps. It is fun to use and
 will make your readings work better for you."

"The LoranGPS program is for Windows 95/98/NT/ME/00/XP and
 includes a conversion calibration capability that makes
 the conversion of loran to GPS the most accurate available.
 This version includes track plotting capabilities that will
 work with almost any GPS.  E-mail us for information on how
 to obtain a demo program."

Even if the function of organizing listings and maps is not
a requirement for your purposes, it also has the ability to:

"Convert from Loran to Lat/Lon (GPS) and visa versa.
 Calibrate the conversions with local knowledge."

...and...

"Enter up to 32,000 readings per file using GPS and/or Loran."

"GPS Lat/Lon readings are accepted and displayed in
 multiple formats such as: degrees, degrees/minutes,
 and degrees/minutes/secs."

"Along with each reading you can include a Rating, Description,
 Color, Symbol, Date Code, and Comments."
http://www.andren.com/

From another page:

"The LoranGPS program automatically converts Loran to Lat/Lon
 or Lat/Lon to Loran and saves both in the readings file. If
 you enter both Loran and GPS for a given spot, the reading
 is considered a calibration reading and no conversions are
 performed on it. The conversion equations the program uses
 were developed by the Navy years ago and are quite complex,
 but they are the most accurate available."
http://www.andren.com/andren/conversn.htm

The program sells for $85, and is compatible with all
versions of Windows:
http://www.andren.com/andren/pricing.htm


POSAID2 is another program which is free, and works in DOS,
and is available from the US Coast Guard site:

"POSAID2 is a DOS program for converting Loran-C Time
 Difference measurements to Latitude and Longitude."

It is accompanied by this disclaimer:

"All users of this software program are hereby put on
 notice that use of this program to produce certain
 desired results is entirely at the risk of the user.
 The Government makes no representations regarding the
 reliability or accurateness of the program and
 specifically warns all users that the program is not
 intended as a real-time navigational program."

More on the page:
http://www.rdc.uscg.gov/rdcpages/soft-posaid2.html



Bob

[Luna Sea 5]

nice find

[sealife]

I could never get the version from the CG to work accurately.  Every GPS reading I converted was way off.  If you decide to try it I would enter some loran numbers that you have an accurate GPS for and see if the results match what you know for a fact.

[IrishAyes]

My unit reads both lat/long and TD's.

If I have TD #s I change the unit to read in TD's and enter the #s. Then, I can go to that location and change the unit back to read lat/long and have them #s for future use/reference.

Check your unit to see if it will do the same.