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
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.
Updated the World Magnetic Model file (WMM.DAT). Without this update, the program will show an error message that the file is out of date. Unfortunately the message points to a defunct web site.
The program has been maintained and improved frequently. If you have an older version, check with the Change History page to see details on the changes in the program since your version was shipped. The version number is not incremented for small changes, only large ones.
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 add substantial improvements in the operation of the program and to remain compatible with new Windows versions as they come along. 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 130+ page manual that is also the basis of the help menu.
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.