duncan_m
Member
I love the new features on the Navionics in particular that you can connect it to AIS on NMEA over WiFi. Great to be able to see other boats and great to see the depth, if it was correct that is.
What I've found is that the depth shown is the uncalibrated depth as passed in the NMEA sentence. For most boats this is somewhere between the waterline and the bottom of the keel/hull.
I raised a bug with Navionics last year in September when they launched the feature. What I have found was that no matter what I set the offset to in the 'my boat' section it didn't seem to adjust the depth shown. There doesn't appear to be an offset change option anymore which is good as it didn't actually make a difference.
Debugging...
The depth shown on the Navionics app is different, by 1.2m to the depth that shows on my B&G depth display + Vesper XB8000 Watchmate app, they both show the same (correct) depth.
So...I did a little digging and had a look at the NMEA sentences that the Vesper is firing out..
The depth is coming through on the app as the 6.6 on the sentence but it's ignoring the -1.2 offset that's coming with it.
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There's also the complexity that some boats might have two sounders and there's no way to select the primary but that's another issue altogether.
I asked again 8 months later after the new AIS alarm feature 'surprised' me while moving our boat ( ) and they said the issue was 'under investigation'.
Given I've given them a more than fair chance as well as all the data here and a bit more to fix it I thought I'd raise it hear and see anyone else has the same issue?
Appreciate not everyone will be hooking up the app to their AIS...
What I've found is that the depth shown is the uncalibrated depth as passed in the NMEA sentence. For most boats this is somewhere between the waterline and the bottom of the keel/hull.
I raised a bug with Navionics last year in September when they launched the feature. What I have found was that no matter what I set the offset to in the 'my boat' section it didn't seem to adjust the depth shown. There doesn't appear to be an offset change option anymore which is good as it didn't actually make a difference.
Debugging...
The depth shown on the Navionics app is different, by 1.2m to the depth that shows on my B&G depth display + Vesper XB8000 Watchmate app, they both show the same (correct) depth.
So...I did a little digging and had a look at the NMEA sentences that the Vesper is firing out..
The depth is coming through on the app as the 6.6 on the sentence but it's ignoring the -1.2 offset that's coming with it.

There's also the complexity that some boats might have two sounders and there's no way to select the primary but that's another issue altogether.
I asked again 8 months later after the new AIS alarm feature 'surprised' me while moving our boat ( ) and they said the issue was 'under investigation'.
Given I've given them a more than fair chance as well as all the data here and a bit more to fix it I thought I'd raise it hear and see anyone else has the same issue?
Appreciate not everyone will be hooking up the app to their AIS...