By Insanity , December 25, in Marine Electronics. Before i buy the sd card for my fish finder i been playing with there mobile app looking at a place I just fished last month. And it's pretty far off a couple of areas.
The water drops far faster in some places then it shows. At another place I can see sticks and logs sticking out of the water where it says there's 11 ft of water at summer pool. Theres at best three ft. Maps are created at a certain water level, when the water level is not at that point, the depths cannot be the same. The Navionics Mobile App, their website's Web App, and their map cards have the exact same maps if updated the same day.
The Navionics Mobile App has a water level offset setting, use it to adjust the lake level to the current conditions. If you have a Humminbird unit and your water of interest is covered by Lakemaster mapping in HD, then you would have the lake level offset choice with that product.
Every digital mapping product has locations that are done by their own survey team, and they have maps that they purchase from other sources to have more content in their mapping products. ONLY the locations that they do themselves will be the most accurate. Locations on the map products that are their surveys are typically identified as HD. Additionally no mapping company collects data for every square foot of terrain. Contour lines between surveyed data points are filled in interpolated either using software or manually.
It is up to the user of those map products to confirm the accuracy of the data with their sonar. My point was even at flood stage the water can't get to 11 ft at the one spot it showed. It doesn't exist ever. The other is steper then it showed.
However I noticed after I posted. I was using a link someone gave to there site direct to a map you could use. There pay app my be much better. No unless you purchase a software that can read a map card. Navionics used to have a software that would NavPlanner II. Garmin has one for their map products. Lowrance may have one that works with their Insite maps. You can have waypoints without any map product. I later surveyed it myself to collect the data to have a HD contour map for it using Navionics Sonar Charts.
It looked like this after many hours of collecting data:. There are incorrect contours at all the places I did not pass directly over. I fix those errors as I take the time to do more data collection if a particular location would be better represented by more accurate data. I just bought it. Before i seen your post. It has the same mistakes as the free Web app. That's what I was viewing earlier the Web app.
Anyway I can get more then my money's worth from it on just the satellite view of the land. I'm always using Google Earth. Hump now the areas im enterested in are downloaded permently to my SD card on my phone. Hopefully some of the water is correct. Most of the areas Ive been fishing are impoundments that arnt covered.
So I can't tell more till I put the boat on some new spots. The state of Florida has various government agencies at the state level, county level, even city and town level who produce their own bathymetric maps from direct surveys of the lakes and then combine that info with satellite image info to produce some really accurate maps that I can download for free from the various government agencies. When I compare the bathymetric maps made by government agencies and then compare it to satellite only made maps I find huge discrepancies.
For example, in Kingsley lake is a second deep hole. It is clearly shown on man-made maps, but the satellite maps I have seen do not even show that second hole. Lake Maitland is another one with a nice deep hole shown on man-made government maps, but the satellite maps I have seen have again completely missed the hole all together.
And as stated above, the contour lines from man-made maps can be different than those from satellite only imaging. How can satellite-only generated maps be accurate when as stated above on well known lakes like Kingsley and Lake Maitland even be considered as "accurate" when they completely miss known holes and don't even show them?
That is NOT accurate. That is hit and miss. Point is, for me here in Florida, I don't even use satellite made maps. I have downloaded hundreds of maps for this state from numerous government agencies and find that for my purposes they are accurate.
One of the lake programs I follow here in Florida called Lakewatch shows on their website how they make the really accurate maps:. One day satellites may be able to look through the water and produce some accurate 3D images, but technology is not there yet. I will comment on this. I find Navionics with SonarChart to be the most accurate a higher percentage of the time, I use Insight mapping and will compare the 2 and Navionics with SonarChart to be far more accurate and up to date.
Yes there are lakes that may not be perfect and I think you will find that among all lake maps. Just to make sure are you looking at the SonarChart layer? There is a huge difference at times between the Nautical chart layer and the SonarChart layer.
What Navionics map card are you using? When on the mobile or web app are you looking at the SonarChart layer? Be sure to click on the sonar icon and toggle it on. Water level fluctuations cannot be factored in when creating maps, they use a or normal pool level when creating mapping. One option depending on sonar you have is to do some SonarChart Live mapping with your sonar and mobile app.
I forgot to mention that another reason I go to government agencies for most of the maps I use is because satellite generated maps never show bottom structure locations.
The Florida FWC has a new program of "planting" plastic trees on lake bottoms all across Florida to improve fish density by giving them artificial cover. They started this new testing program in Lake Griffin. I want to know where these artificial trees are being planted all across Florida. Satellite map companies will never give me that information. But the FWC does give it to me for free since our tax dollars have already paid for it!
Once I collect this data it can be programmed into GPS and also be added visually to edited digital maps I have archived. The first large-scale, comprehensive evaluation by the Florida Fish and Wildlife Conservation Commission of artificial, recycled plastic fish attractors in Florida is beginning in Lake Griffin.
Thompson said there will be 18 quarter-acre sites in the lake, with structures in each site. Twelve of those sites are regular brush attractors that already have been deployed, while six of those are the recycled plastic attractors.
Thompson said the usual Boating Maps App Report oak brush attractors start to lose their complexity after three to five years, while the plastic attractors could last for 10 to 20 years. The brush attractors were placed several weeks ago, and Thompson expects to be finished putting in the recycled plastic attractors by next week.
The attractors will be both for research and to help concentrate fish for fishermen. Thompson said in areas that are not over-harvested, the Florida Fish and Wildlife Commission wants to help people catch fish.
Thompson said any offshore structures and cover help attract fish, and more complex structures attract more fish. Thompson added there are short- and long-term goals for the project, with an initial goal being to see how the plastic attractors compete with brush attractors in concentrating fish, and a long-term goal of seeing how the plastic attractors compete with brush once brush starts to break down.
Twelve members of the Hawthorne Fishing Club volunteered to put together the artificial attractors on Monday. Bill Connelly, a member of the fishing club, said the group of fishermen wanted to do what they could to help Fish and Wildlife improve fishing and the lakes.
The artificial attractors have 30 limbs on each. The plastic attractors have been used in other states and, from what Thompson has seen of those results, they look promising, he said.
When using the Sonar Charts map layer, you need to verify if the contours are user generated or pre-Sonar Chart data with your sonar.
Just like any other map product, only the bottom contours will be accurate where depth and location data was collected. Most all bodies of water got preliminary contour lines when that program started. Those lines were created to be adjusted by uploaded sonar logs. If you did not supply that data and know what areas are accurate, you should not assume any part of those maps are accurate.
This is a composite of sonar log tracks that was used to create the Sonar Chart map I posted above. ONLY what is exactly under those red lines is accurate. All other parts of any of the contour lines are interpolated fake. Only when that lake is solid red from sonar log tracks will the entire lake map be accurate.
Additional info about Sonar Charts to show why you need to verify with your sonar if any mapping is accurate. This is the same lake as above. This was the fix as the result of the sonar log track. Note the waypoint coordinates at the top left of both map examples:. Would you please post some map images of a Florida lake Maitland in Orange County Winter Park and post what your maps "see" around the Isle of Sicily for deep holes and bottom contour?
Or, Kingsley Lake in Clay County?
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