Just a heads-up, as I've mentioned elsewhere, if using Navionics HotMaps (latest versions) on Lake Lewisville, adjust by about 4-5 ft shallower the "depth contours", everywhere I've gone the past few weeks, things that should be at least 2-4ft submerged at current elevations are "surfacing", so it appears there is a problem with their contour mapping depth offset on LL, like it was 4ft high when scanned and not compensated for back to conservation pool, or something like that. If your experience differs feel free to reply here, but humps that should still be be several feet safely submerged according to the contours, are actually at the surface in my experience. I'ev also used the PC App at home to look at the humps I grounded on in Stewart's Cove, so it's not a sonar offset problem, the shallowest should still be 5ft deep "today" according to their maps, but is at the surface now.
I wish Navionics would allow custom per-foot "safety depths" (or preferably a lake level offset like on Hummingbirds). The default gaps are too wide for bass fishermen.
From the Corps website , LL level is currently about 7ft low. But from what I've literally run into, the current "safety depth" needs to be at LEAST 13ft+ (in other words, you are hitting ground in places that show a contour line at 13ft, meaning it's only about 1-2ft deep at those places instead of the expected 5-6ft).
I've dragged bottom and skeg a few times (and stalled out main motor once forcing me to trim way up and power off) on humps that had a starting contour line at 13ft (meaning the top should be at least 12ft deep from conservation pool according to the navionics, or should be at least 5ft deep at current lake elevation)).
Just be careful, and on any lake check the current elevation before heading out and find a few humps first thing in the day that should be safely submerged on the map to idle over and make sure that you are getting the expected differences.
Edited by ChrisTexan (11/21/11 11:32 AM)