SeaMarks upgrade download

Name Change 

This program has been continuously revised since its' first sale in 1985. It started out completely Loran centric and was called the "Loran Program". It evolved towards GPS centric with a name change to LoranGPS. I recently renamed it SeaMarks (think wet landmarks) to make it more generic yet specific to marine navigation.  I also changed the name of the folder the program operates from.  It used to be "lorangps" and is now "SeaMarks". .During the install, you can either redirect it to "lorangps" or let it go into "SeaMarks" and either leave your files in the old folder or move them to the new one.  

This page is for the use of owners of previous versions who have purchased an upgrade. It is intended to get you up and running as soon as possible.  It is assumed that you have purchased the upgrade and want to download it to work on while waiting for the CD or USB to arrive.  Generally, you will not need to install again from the CD/USB unless your old program was very old or is missing .  Place the download in a temporary location like: DOWNLOADS and run it from there.  It will prompt you for information and locations. You will need a User Preferences file from your old installation or an access code (sent to you in the e-mail that led you here) in order to use this upgrade. The free upgrade privilege exists for two years after your last purchase. After 2 years, you should buy an upgrade.

When you get the CD or USB, you can, if needed, use it to install the program again. There are NOAA charts, Waypoints, and other useful items on the CD or USB, so you might want to install again from it.

Download the 10.2 version of the program -(6/11/22- 28,563,176 Mbytes)



You can use the program without the NOAA charts but you might already have them. They will be on the CD/USB, so you can wait to install them when you get the CD. If you are upgrading a reasonably recent version, you probably already have most or all of them. If you lost all of your previous installation in a computer crash and don't have your installation disks, then you may get them when the mail arrives.

Note: If you have calibrated your old program, this upgrade may overwrite that calibration. You will need to repeat the calibration if you find that the new pre-calibrated tables are not as good as the ones you had calibrated.

The program install location has been renamed SeaMarks from LoranGPS.  You can install in that old folder or into the new one and move your files over to it.  If the program sees a LoranGPS folder while operating in a SeaMarks folder, it will ask if you want to relocate your files.

Quick Setup Instructions

When you have completed the installation as described above, you will open the program and may need to personalize it. The setup will attempt to use your existing User Preferences file, but if that is missing, it will install a new one. Personalizing is primarily setting the printout title and the center lat/lon of your fishing area. It is also good to set up your reference inlet at this time. The program is shipped with a UserPreferences file pre-set for the region of the country the customer is located in. If your location is is different from what has been pre-set, then change whatever information you need to. If it is completely inappropriate, then consult the manual for further instructions on the setup. Assuming that you have properly set the User Preferences, then you save those settings and close that form.  Videos showing this and other operations are on the website Videos page

If you put the program into the "SeaMarks" folder, the program may see that you have files in the old "lorangps" folder and ask you if you want to move them.  You don't have to.

Thank you for purchasing this upgrade and good luck fishing.

Go to Andren Software Home Page

Appeal for calibration data

In order to better serve the Loran/GPS community, I need calibration points for various areas of the country. With this data, I can pre-calibrate the ASF tables to make it unnecessary for people in those areas to calibrate the program. With the shut down of the Loran system, many users will not have good calibration data. They thrash around with inadequate data such as read off maps. This makes for bad feelings about the program and many internet postings about how one cannot do a good conversion with a computer program. If you send calibration data, I will keep this information confidential and only use it to improve the pre-calibrated ASF tables. Your waypoints will not be disclosed. If you want recognition for your efforts, I can post appropriate credits. Please send good calibration data taken with a real Loran and a GPS simultaneously. The more points, the better the calibration will be. For 9960 and 8790 data please indicate whether it was taken before 1/17/07 or after as the station timing changed on that date. You can get calibration data from readings taken years apart as long as you know you are at the same spot when you take the GPS data corresponding to the Loran data.

The current calibration data was donated by:

Beau Radford- TX, Bob Stapleton-Mexico Bch FL, Carl Andren-Melbourne, FL Dale Olds-Destin FL, Dave Timpy-Masonboro NC, Don Busby-St. Pete FL, Jeff Emery-Daytona FL, Floyd Carrington-LI, Frank Dorio-NJ, George Steller-LI, Jim Netherton-St. Augustine FL, John Lane-St. Augustine FL, Kirby Klys-Middle Grounds FL, Mike Mahaffey-Destin FL, Rick Barnhardt-Holden Bch NC, Ron Surrency-Jacksonville FL, Stephen Shaddock -Lake Charles LA, Tom Brodley-Carrabelle FL, Tom Downey-Jacksonville FL, Tom Littlepage-Mobile AL, Uwe Lovas-MD&NC, Val Thomas-St. Augustine FL

Modifications and Bugs fixed since version 7.0: Click here for the list