General > Frequently Asked Questions

NVB (Navionics Value Bundle) - Lake List

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RGecy:
Here is the NVB - (Navionics Value Bundle) Lake List

Click Here to download the PDF File

Includes
North
South
East
West
Canada

Sundancer:
Navionics charts are among the best.

However, depth data on all the various suppliers charts, including Navionics, is usually derived from USGS elevation data pre dam building rather than from actual sonar surveys. This data should be considered as a general guide - and not as actual, current, real world conditions.

True bathymetric surveys of inland lakes are labor intensive (several hundred thousand data points for the average lake), require consistent equipment and procedures, and are rarely undertaken. A very few states have started building such actual bathymetric databases, and even these have limited coverage of their waters.

Public access to accurate, current bathymetry is a rare bird, but we are light years ahead of where we were a decade ago (at least in general terms). Having considerable experience in GIS I have been attempting to develop (for personal use) data on the waters I fish using Humminbird sonar depth and location data. Humminbird's offering of GPS units capable of up to 1 meter accuracy (AS GRHA) is a step in the right direction.

RGecy -
1 - If the older Matrix systems are not able to utilize this new GPS unit, what is the least expensive current Humminbird unit which is compatible with the AS GRHA?
2 - Is there a way to include the Lat/Long or timestamp in the depth sentence of the Hummibird NMEA output so as to more closely relate position to depth? (Lowrance does this by creating a "valid" stamp on depth readings that are considered adequately geolocated, although with a proprietary file type and coordinate system )

I know this accuracy business sounds like nitpicking to the average Humminbird user, but consider that the reliance on data collected before there was a reservior... applied to the water as exists now, add in the sum of human and technological errors and your trolling plan could be off by 100 yards longitudinally, and only God (and your Humminbird) knows how far by depth. :D

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