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Bathymetric Maps Help

Nutterbuster

Nutterbuster

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Oct 12, 2017
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Where the skys are so blue!
Soni downloaded Navionocs to try to locate some holes to fish in the local water. It looks interesting, but I don't really know what I'm looking at. I know it's the opposite of a topo (hills are holes) but I don't know what the numbers are. Anybody used Navionics or familiar with bathymetric maps at all?

Screenshot_20200310-121918_Boating HD.jpgScreenshot_20200310-121918_Boating HD.jpgScreenshot_20200310-123143_Boating HD.jpg
 
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CptFrank

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May 22, 2019
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Those are depths at "Mean Lower Low Water" which translates to the average depth at the lower of the two low tides you get in a day. If you dont have much tide range you can just treat it as the average depth. Since there is the subscript on the numbers i think your units are in either meters (so 16 sub 6 would be 16.6m) or fathoms and feet (so 16 sub 6 would be 16 fathoms and 6 ft) either way you can probably go change your depth units to feet and make it clearer.
 
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Nutterbuster

Nutterbuster

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Oct 12, 2017
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Where the skys are so blue!
CptFrank said:
Those are depths at "Mean Lower Low Water" which translates to the average depth at the lower of the two low tides you get in a day. If you dont have much tide range you can just treat it as the average depth. Since there is the subscript on the numbers i think your units are in either meters (so 16 sub 6 would be 16.6m) or fathoms and feet (so 16 sub 6 would be 16 fathoms and 6 ft) either way you can probably go change your depth units to feet and make it clearer.
Click to expand...
Thanks! I verified it was in meters, and figured out how to switch it to feet in the app.
 
Weldabeast

Weldabeast

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May 23, 2019
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Northeast Florida
@Nutterbuster if you want good nautical topos the is an app call "free us topos''.....there are probably 8 different nautical maps to choose from. Wrecks and reefs show up on certain maps. We use it when we head out in the ocean...works as GPS also
 
elk yinzer

elk yinzer

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Oct 23, 2017
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Thou shalt not post bath pics on the innernet! Now everyone knows your sacred gar hole.

But the subscript is usually fathoms what I'm familiar with but the math don't quite add up in yours.
 
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