Creating your own lake on Navionics/Lowrance

Our two fishing club ponds are private and not on the Navionics+ maps. Anyone know of a way to add/create a lake to upload to Navionics or other Lowrance users? I was hoping to build our ponds in so that when I mark fish or spots, it does not look like it is in a field. Even more, I would like to sonar map the bottom so that we have some real detail. This would help us planning where to sink brush.

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STLKayak
2020 Pro Angler 14 360
St. Louis, Missouri
https://www.facebook.com/profile.php?id=100005695487937

You betcha. You could use Lowrance's insight genesis public or private online map program, or, try Reefmaster mapping software for even better options on mapping. Some learning curve will apply.

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Mark
Tandem Island- 2013
2 - Sports - 2014

+1 for Reefmaster software. I use it to make charts of my local lakes for my Lowrance unit.