Thread: lakemaster question

I upgraded my old lowrance to a humminbird 899ci over the winter, a month ago I purchased lakemaster great plains V5.0. Every time I've been on Truman lake the contour lines don't match up with the actual depth, even after adjusting for the 5' above normal.
I've been on LOZ a few times with it and it's within inches.

Mine doesn't do well on Truman either!

Try it without the depth offset

Originally Posted by vic n

Try it without the depth offset

Even if I took the offset back to zero it would still be off by 10'

When they mapped tRuman it was 10ft high. Found some old post on here. You can adjust the countour lines to what your sonar is reading and it will change them for the whole lake.

Originally Posted by ragnar

When they mapped tRuman it was 10ft high. Found some old post on here. You can adjust the countour lines to what your sonar is reading and it will change them for the whole lake.

Well I learned something new....thanks

Very interesting. Did you purchase that card from a retailer or Great Plains?

From what I've read, Lakemaster surveyed Truman when it was 720 feet. So for normal pool you set it -14 feet, and adjust up or down from there.

Originally Posted by dfar

Very interesting. Did you purchase that card from a retailer or Great Plains?

I purchased it from Rogers sporting goods in liberty, mo.

The card was the great plains region.

Great Plains version is it. it works fine. I have had 3 of them, 899, now have 859 up front, 1199 at dash. works great