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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
Even if I took the offset back to zero it would still be off by 10'Quote:
Originally Posted by vic n
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....thanksQuote:
Originally Posted by ragnar
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.
Rag is right, took me a while to figure that out....why they wouldn't adjust it in the software is anybodies guess....but great unit.
there are 2 depth offsets on that unit...one is a depth offset for navigation(adjusts contour lines-what you want to do)and one is for the transdeucer offset(real time reaout). ....i.e. if the bottom of the boat sits 10 feet deep in the water with the transduecer attached at the bottom of the boat, it would show you in 10ft shallower than you are in . ...you would offset the depth finder from the bottom of the boat(+10 ft.). itr adjusts the main depth readout you watch while trolling etc...
in the pic you posted, you are sitting in 43.4 feet of water assuming the transduecer offset is right. you are on a 57' contour....now you need to adjust the contour lines....what i do...sit at the ramp or on a large flat where the water is depth is constant for a ways in each direction if you float etc(don't do this on side of drop off)and see how much water you are in, then go to the navigation tab(hit menu 2X i believe-going from memory) and go to little US map tab across the top. then tab down to depth offset. adjust up or down until your contour line depth reads the same as the depth reading you are recieving...the contour lines will adjust right in front of you....and u r set...it will adjust the rest of the lake ...when done, the contour will read 43 feet and the readout will read 43.4'. if the depth in the upper left hand starts adjusting , you are on the wrong depth offset...
once you master that unit you will love it, but plan on taking a few afternoons to figure it out..also Doug Vahrenburgh on youtube does an awesome tutorial and he shoots it on Truman...
another thing i really like to do is highlight depth range, say i pick 10 feet +- 2 feet. that will give you all water from 8-12 feet deep. make the highlight green and then run down the lake and see all the points, humps etc lite up for the depth range you have selected...changes the way I fish... ...you will like that
here he is on Truman
https://www.youtube.com/watch?v=ahIg...UemOg2YXlBc5MP
depth highlight range i mentioned is right above it...
Thanks for the link, HC
I purchased it from Rogers sporting goods in liberty, mo.Quote:
Originally Posted by dfar
The card was the great plains region.
Why on earth wouldn't they adjust the software to match normal pool?Quote:
Originally Posted by HuskerCrappie
Thanks for the link. I actually went to a free seminar he put on, he was more interested in selling humminbird, Minn kota, and lake master products. I however learned a lot by watching his YouTube videos.
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
yeah.... i asked a guy at LM and he didnt have a good answer. but once i got my head around it, i figured out it doesn't matter what pool is,...as long as your contour and an actual depth are the same, u r set go fish.
pretty sure the reason it is so close is that the lOZ fluctuates so little....so when they mapped the lake it was close and stays close...Truman can fluctuate wildly...when the lake is about 15 feet high above pool , your unit will be within inches without making adjustments. I think Truman was mapped at 718 or something like that...Quote:
Originally Posted by vipershooter
This is right on. I make this adjustment if needed each trip as I idle out to no wake buoy. Just go to map screen and idle over depth change while moving offset up or down so the depth matches the contour. It sounds like a hassle but sure beats other map cards where there is no way to adjust for high or low lake levels.Quote:
Originally Posted by HuskerCrappie
Thanks for the info!
This is awesome information! Thanks everyone. I am about to purchase a Lake Master Map for my new 999SI and this will certainly help me to set it up correctly