“We have them by other lakes in this area of South Dakota,” Paul says.
Indeed, ten burial mounds in the Oakwood Lakes area in nearby Brookings, SD, are “typical of numerous such mounds in eastern South Dakota,” according to the text on a state historical marker there. Those mounds, dated about A.D. 300 to A.D. 1400, according to the historical marker, are probably the remnants of late Woodland or Middle Missouri Cultures.
“All of the mounds are strikingly similar about 3-6 feet high and about 100-150 feet in diameter,” the historical marker reads. “The so-called ‘Mound Builders’ made pottery, stone hammers and projectile points which may still be found in the area. … It is believed that the mounds were built by individuals who carried baskets of earth on their heads and then dumped the dirt to form mounds.”
Shown at one-foot contours at the bottom of a 424-acre lake near Madison, SD, the humps Stark discovered have such steep sides that they appear “almost 3D” on his Insight Genesis map, he says. “Now that is detail on the humps! Man, I love mapping lakes and seeing stuff like this!”
Paul’s screenshot of these unique lake-bottom structures is this week’s Insight Genesis Hump Day “Hump of the Week.” Have you used Insight Genesis to locate bottom structure not shown previously on any other lake map? Post a screen shot on the Insight Genesis Facebook page and we might feature YOU in our next Hunp of the Week spotlight. (Click “Continue Reading” to see larger screen shots and learn more)
Insight Genesis is the innovative, online service that empowers anglers to create custom lake maps from sonar data recorded with the Lowrance, Simrad or B&G sonar unit on their own boats. One-foot contour lines on Insight Genesis maps are much more accurate than the estimated contour lines on many off-the-shelf, digital chip maps that not only miss, but often obscure, bottom structure. (Blog post continues below the image)
When Stark saw his first custom Insight Genesis map on his Lowrance HDS GPS/sonar unit, it was “unbelievable,” he says. “There was more information, by far, than you get on a store-bought chip.”
You can harness the power of Insight Genesis for yourself with a free account or a Premium subscription. With either, you can create, use and save unlimited custom maps and Insight Genesis Social Map charts online; contribute sonar data; create, edit and store waypoints; manually adjust water-level offsets; and analyze weather trends. To register for a FREE Insight Genesis account and see Social Map for yourself, visit the website at https://insightstore.navico.com/genesis
Premium subscribers can load custom maps and Social Map charts onto their compatible* Lowrance Elite HDI, HDS, Simrad NS Series or B&G Zeus GPS or chartplotters for use on the water. As a Premium subscriber, you can also create unique bottom-hardness and vegetation-location maps, and can choose to mark your maps as private for personal use only. No matter which option you choose, your trails, waypoints and other personal data are always kept private. (Blog post continues below the image)
With Insight Genesis Social Map, people like Paul Stark across the country and around the world are community-sourcing the mapping of poorly mapped and/or un-mapped lakes in their areas and sharing their new, custom maps with others, who in turn, are sharing their maps with you. A one-of-a-kind online database of custom contour maps generated and shared by the Lowrance community, Insight Genesis Social Map is built on a base layer of existing Insight contour charts. It refreshes itself in near real-time with sonar data shared by the Insight Genesis community.
* To use your custom Insight Genesis maps on the water, you’ll need a Lowrance, Simrad or B&G chartplotter from this list: https://insightstore.navico.com/supported-products