FREE Internet Sources – Lowrance® Sonar Log Viewer

Raising the level of fishing satisfaction is one of the primary missions for Combat Bass Fishing™.  One of the ways to do that is to turn people on to some of the free tools that are available over the internet.  The Lowrance® Sonar Log Viewer is one of those tools.  If you have a unit that accepts chips then an inexpensive way to log your sonar data on the water would be to purchase a SD or MMC chip, insert it into your unit and start logging the information scrolling across the screen of your sonar.  (Disclaimer: I’m not sponsored by nor do I work for Lowrance®.)

Once you have logged trip information you can insert the SD chip into a card reader and put the file onto your computer.  Now you are ready to use the Sonar Log Viewer program.  First of all, download the program from the Lowrance® website at:

Once the program is installed just bring your raw data file up and see everything you logged while on the water that day.

Sonar log from the North Channel in the St. Clair River

This all sounds fine and good but what good is the sonar log without a point of reference? Perhaps you already found it on the image but there is a text box with the GPS coordinate, depth of the cursor, bottom depth and time. This software allows you to collect that information from anywhere you place the cursor on the log. Now we are getting somewhere!

Here are a couple of logging suggestions…

* Have a plan before you launch – Having a plan will help to keep your records in order later once you view the logs in the comfort of your home. There’s nothing more frustrating than to have a great piece of structure showing on a log but not know what it is. Having a plan increases the likelyhood that your records will show where you went, what you were planning on researching and notes about what you found. The graph only shows the sonar image. That image isn’t always easy to interpret without some reference information handy.

* Keep your plans and notes in a bound notebook – A single source for plans and notes can keep you sane when looking over years of logged information.

* Log data in small segments then write down the file name the sonar unit gives you for later reference. Even though you can grab the coordinate for any piece of structure shown on the log, long logs can make relating the structure you see to a place on the map difficult. It’s much easier to log a small area, run the log on the Sonar Viewer, grab the coordinate with the cursor then go to a small, designated area on a map and either draw the structure in (on a paper map) or insert the structure (into a digital map).

The entire process of logging information is an extra step while on the water but it can yield big results. How many times have we passed over a piece of structure we thought would hold fish and didn’t mark it with the GPS, write it down or even find it a second time when we tried to go back. Those “found” spots can come in real handy when looking for somewhere to fish away from the crowd.

(c) 2010 Wayne Carpenter

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3 Responses to “FREE Internet Sources – Lowrance® Sonar Log Viewer”

  1. Michael Dix Says:

    I understand that there are ship wrecks on lake St.clair. Would your books or maps have the GPS coordinates for these?

    • Wayne Carpenter Says:

      A couple of wrecks show up in the Marked Map Series maps, one in the books and one as a EGS downloadable report. Strawberry Island marked map has a small crib the a couple are on marked maps that go up the Middle Channel(Middle Middle Channel and Upper Middle Channel). One of those Middle Channel Wrecks is in the No Secrets Vol. 2 book also. Oh yes, there’s one by Fawn Island which is on the Fawn Island marked map and available in a two page color report from Electronic Guide Service. Generally the wrecks in Lake St. Clair are pretty worn down as far as the structure goes. What’s left holds fish but much of the wreck has been swept away. The St. Clair River and Lake Huron have wrecks with large portions of the structure intact. The wrecks listed in my publications above do have coordinates.

  2. Wesley de Klerk Says:

    I have downloaded the sonar viewer programme, but i cannot open the raw data in the programme. Any suggestions?

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