The Andren SeaMarks® [aka LoranGPS] program is a tool for fishermen and divers to manage collections of GPS (or Loran) waypoints (readings or marks) and print an organized book of listings and maps. It is easy to use and will make your waypoints work better for you. Its features allow you to plan fishing/diving trips that save time and fuel and to analyze your waypoints for promising areas to explore.
It also allows you to easily move your data into and out of a GPS via a memory card transfer or a serial cable transfer.
Manage your book of waypoints on the computer. Print your book with spreadsheet listings and charts. Coordinate your book with your GPS track plotter
Enter up to 32,000 waypoints per file using GPS and/or Loran data.
Convert from Loran TDs to Lat/Lon (GPS) and vice versa. For improved accuracy, you can precision calibrate the conversions using local knowledge.
Download waypoints, routes and tracks from a variety of GPSs using Memory card transfers or serial port / USB connection. Upload waypoints to a variety of GPSs.
Import or export a large variety of data file formats for compatibility with other programs and GPSs.
Move waypoints from one GPS to another. This allows you to move your waypoints out of your old GPS and into a new one even if it is a different brand or model. You can also make sure that your secret spots are removed and safely stored when you ship the GPS back for repairs or to another owner. Alternatively, you can remove your secret spots and install one of the files from our Waypoints page when you sell your old GPS so the new owner has something to start with.
Along with each waypoint you can include a Name, Rating, Description, Color, Icon, Depth, Group, Date, and Comments
GPS Lat/Lon waypoints are accepted and displayed in a variety of formats such as: degrees only, degrees/minutes, and degrees/minutes/secs.
Display Lat/Lon or Loran with a variable number of decimal places.
waypoints can be given distinctive colors on listings and/or graphics.
Sort your waypoints numerically or alphabetically on any column
Display list in pre-formatted or user customized spreadsheet styles:
Group your waypoints to make it easier to find them in your GPS.
Show waypoints on simple charts (as above) or NOAA charts shown on right.
Display waypoints, routes or tracks on Google Earth
Display waypoints on charts as Names, dots, icons, or numbers.
Pan and zoom simple chart anywhere, and in any scale.
Center the chart on any reading.
Expand any portion of the chart.
Selectively include Lat/Lon lines and/or Loran lines and a coastline on the chart.
Get details on any reading on chart.
You can chose the color (on screen and printer) for chart lines and waypoints.
Labels and symbols can be included on charts.
Alternate black background for night time viewing.
Harvest sonar log data easily
Operating System Compatibility
PC The LoranGPS program is for Windows 95 through Windows 10 and requires at least 30 MB of disk space (more with charts). MAC It will run on Intel based MACs using CodeWeavers' CrossOver for the MAC. My recent experience is that something has changed and now it is harder to install properly with the latest versions. See: Installing on MAC . CrossOver costs $60 and does not need a copy of Windows to run. MAC owners can also use a Windows emulator like Parallels or dual booting to run it but these require a legal copy of Windows to run. For Crossover, see: www.codeweavers.com and check LoranGPS in What Runs.
Conversion service is available if you don't want to buy the program, but just want to get some Loran points converted or points moved from one brand of GPS to another. The charge depends on the work needed. If you do the data entry, it is much cheaper. If your data is in electronic form and can be copied and pasted, then you get a flat rate of $30. If you send us a hand written list that has to be typed in by us, then the rate depends on the number of waypoints. Call or write for a quote. Indicate what form your data might be in.
7/12/15 Added international capability to handle both East longitude as positive and the use of a comma as the decimal point. Fixed an issue with the text importer.
Previously, Added the capability to plot the calibration error pattern for better visibility into the process. With this you can see if the calibration data has significant biases or patterns that will effect the results. Fixed an error that prevented an auto-save for each waypoint entered. Nothing was lost assuming you saved the file when done. Improved the Furuno GP1650D upload/download utility.Added import for Coastal Explorer and GPSU native files. Added import and export of tracks for P-Sea Windplot and Nobeltec ONF formats. Added support for Furuno GP1650F files on import. Modified the way it handles the name field. Removed upper casing and adding dashes. Fixed an issue introduced 7/23 that gave an error when opening a pre 8.0 file. Fixed an issue with the Furuno NN3D routes importer. Adjusted the icon translations for Garmin. Added capability to handle more than 32500 track points. Added Lowrance version 5 waypoints to the import/export capability. Fixed the calibration routine that was broken between 4/13/14 to 4/24/14. Added a new terminal program for uploading and downloading your GPS via a serial cable. This should be easier to use than the one previoulsy borrowed form the OziExplorer folks. It also handles more models of Furuno and Simrad GPSs. Added a Group field to the data base. As GPS waypoint storage capacity has increased, some manufacturers have added the ability to group waypoints into folders. This new Group field is to manage those groups (folders). It is also useful for holding the names of routes and tracks. Added means to fill the Group field. Added a Raymarine import archive.fsh routes, GPX routes and tracks import. Added import and export capability for Furuno GP1870F routes (PNT extension). Fixed a few issues in the GP1870F waypoint impoort and export. Added import capability for Raymarine C/E series (Archive.fsh) routes. Now can import waypoints, routes and tracks. in this format. Added import and export for Furuno GP1870F routes. Changed version number to 8.0. Added import/export capability for Garmin ADM style routes. Fixed an issue with the Garmin ADM exporter. Added import and export capability for the new Furuno GP1870F series. This is the first available industry capability for handling this new file type. Announced a collaboration with Maps Unique in offering their data base of over 3000 offshore fishing aypoints in the North Georgia Atlantic coast through North Carolina. See the Maps Unique tab for details on this offering. If you already have the SeaMarks program, see our Purchase It tab to order a disk of just the waypoint files or an upgrade with the waypoint files.. The combination of SeaMarks and the Maps Unique data files on one CD is also offered on this tab for those new to SeaMarks. Please note that this is the data base only and does not include their printed charts.Added the capability to create a KML file to display loran grids on Google Earth. Fixed some issues with the import/export routines. Added a Google Earth export function so that you can display your data base, routes, and tracks on Google Earth. Added a Si-Tex version of the C-Map proprietary file structure for importing. Made the Garmin ADM exporter capable of handling more versions of this file structure. It is much better at creating a userdata.adm file that will work in your unit. Added import routines for Lowrance routes and tracks for all versions of the USR file style. Added ability to plot routes on simple charts. Fixed the Furuno exporter that would not export names. Added some more waypoints to the web site download. Revised all the waypoint exporters to allow the Save-As capability. And many others.
The program has been maintained and improved frequently. If you have an older version, check with the product support page to see details on the many changes in the program since your version was shipped.
NOAA chart view
We've Been Published
These articles show that the program has been around a while and has gotten good press.
The Andren Software Co. has been publishing this program since 1986 and has incorporated many features requested by users. The program gets updated frequently to take advantage of the enhanced capabilities of new Windows versions as they come along and to add substantial improvements in the operation of the program. We always strive to make the program useable by those who have little knowledge of computers or have no feeling for Loran or GPS. The program comes with a 16 page mini-manual edited by Carol Andren for clarity and understanding. You also get a soft copy of a printable 100+ page manual.
Carl Andren, the creator of this program, is a member of the Institute of Navigation, the International Loran Association, and the Institute of Electrical and Electronic Engineers. He holds 26 patents in electronics including some on the IEEE 802.11 technology known as WiFi.
Viewing your files on smart phones and tablets.
If you want to take your files of waypoints out to sea on a mobile device, there are several ways. Export the file as a CSV file and use the Apple Numbers app or Android apps like Sheets, OfficeSuite 7 by Mobisoft or CSV Viewer by Chiraton.
Apple Numbersmakes it easy to view your spreadsheets. Numbers lets you import documents in common formats, including comma-separated-value (CSV) files.
KMLZ by Wrightrocket for Android and KML Viewer by NextBusinessSystems for Apple allow you to view your waypoints, routes, and tracks on Google Earth when you have a connection. Just export the files to the KML form and have them on your phone when you run Google Earth using the Android app: KMLZ found on the Google Play site or KML Viewer found on the iTunes site.
Many other similar apps are available, so you should have no problem finding one that suits you.