Merge sonar logs from multiple trips for complete maps

To ensure quick uploads and prevent file corruption, makers of C-MAP Genesis custom lake maps can record several smaller sonar-log files while on the water, then merge those logs later into a master lake map.

Depending on the size of the lake, creek arm or river section you’re mapping, you can create a complete, custom contour map from multiple sonar logs recorded in a single day or over multiple days, and with no complicated computer programming required by you – C-MAP Genesis’ innovative Cloud-based processors do all the work. That’s one of the many benefits of a Genesis Edge subscription over a free account. Other benefits include custom bottom-hardness and vegetation-location maps. (Blog post continues after images below)

Nine Trip Collage
Before …
… After

Follow these easy steps to merge multiple sonar log files into a master map:

  1. Log into your account at
  2. In the box titled “Trips” on your dashboard page, hover your cursor until the blue “GO TO YOUR TRIP LIST” button appears and then click that button (see image below).
  3. In the dashboard that opens, look in the “My Uploads” column for the name of the waterbody for which you are interested in creating a merged map
  4. Clicking the name of the waterbody will open a list of all the sonar files you’ve uploaded for that waterbody — click the “View Trip” button for any of the files you’d like included in your merged map
  5. Clicking “View Trip” will open a C-MAP Genesis map of the area you covered … Sonar Review pane
  6. Click the “Merge” tab in your interactive Genesis viewer to see a list of your sonar logs from the same water body, organized by date.
  7. Select the files you’d like to merge by checking the boxes and clicking “Merge.”
  8. Watch your email in-box. You’ll receive an email when the Genesis processors are done merging your data into a single, custom map.

Upload speeds depend on sonar log size and your Internet connection speed. Map-creation speed is based on the size of your logs files and total data size. The size of the water body might also be a factor. Recording multiple, smaller sonar-log files can provide better results, especially for Genesis users with slower Internet connection speeds. Click over to this blog post for tips for recording smaller sonar-log files.

29 thoughts on “Merge sonar logs from multiple trips for complete maps

    1. Tim: To merge more than 12 trips into a master map, you’ll want to upgrade from a free account to a Premium account. A Premium account will also give you bottom-hardness and submerged vegetation-location map layers — very powerful tools for identifying and expanding on successful patterns.

    1. Yes! Save each lake’s downloaded files into a separate folder on your computer, and then save all the separate folders to your SD card.

      1. Sure, just pay a small $100.00 fee for premium that last a whole year. then you get to pay another $100.00 fee when that expires. isn’t that wonderful

      2. Jason — If in the first year of the Genesis Edge service you survey and create maps of all the waterbodies or areas on waterbodies that you are interested in, you would not need to subscribe for additional years (and thus incur additional charges). The maps that you create during the year of your subscription are not dependent on having an indefinite subscription — meaning, the maps will continue to work after you no longer have a subscription. — Greg

  1. if I’ll want to upgrade from a free account to a Premium account I can upload and merge old sonar logs with a date before the date of upgrade?

  2. Are both legacy sonar trips and the new sonar trips dated 2018 (already uploaded) available to merge into a single map with an upgrade to the premium version?

  3. Hi Greg I have about 19 hours of the same water body uploaded to my Insight subscription now so the merge files are stating to get bigger and take longer to process, Do I have to merge the whole lot each time to create a new merge (which I dont think will scale to our water body or can I just add the new ones. Also how does the merge relate to the map generated if at all
    Best Wishes

    1. Mark, any time you record new files on the same waterbody and want to add them to create a more-complete map of the waterbody, you must create a new merge that includes all your files. Unfortunately, the process that enables you to merge trips into a map does not work in a way that new trips can simply be added to an existing merge. — Regards, Greg Huff

  4. Hi, last year I uploaded log files with a free account and added them to the social map. Now I’ve upgraded to a premium account and uploaded some new files from the same waterbody. The old files were not shown to merge them into my personal map, even after trying to upolad them again. What do I need to do to create a private map which include all the log files I created. Many Thanks and Best Regards

    1. Guido, sorry I missed this message earlier. Are you still experiencing the same issues? If so, message back and we can try to figure it out. — Greg

      1. Hi, I am also experiencing the same issue. I now have a premium account and am not able to view my uploads from when I was using a free account. Also I do not have the old uploads to try to re-upload.

  5. I want to create a high resolution map of a tidal area. (Alameda Estuary)

    How do I account for the different state(s) of tide with multiple files at different times?
    is there an ability to enter the tide level that the file was taken at ?
    I don’t mind adjusting the values of the depths in Excel or similar tool if that’s what’s most appropriate.
    Presumably they should be referenced to MLLW?

    1. Trips are automatically offset for tide levels. You can also add manual offset from the Offset tab in the trip viewer.

  6. We cant choose the resolution of merge maps , there is a big diference resolutions of merge maps with log sonars before and after 2018. Im dissapointed

  7. If I pay for a year to create my own maps and then don’t subscribe the following year do my private maps become public?

    1. No, they will not become public if your subscription expires. Private sonar logs will remain private unless it is requested by the user to make them public.

  8. If I map a private lake that hasn’t been mapped and want to keep my maps private, I’m assuming that I’ll need a premium membership and I’ll need to continually renew it, as they will become social maps once I don’t renew. Is this correct?

    1. No, they will not get added to Social Map if your subscription expires. Private sonar logs will remain private unless it is requested by the user to make them public.

  9. Can you view a Navionic plus card and the private downloaded map i created on a split screen with both cards in each slot of my HDS 12 gen 3

  10. Ive merged 2 different bodies of water , i would like to be able to view them again , but when I go to view the merged maps it won’t let me look at my sonar .

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