Can you post a screen-shot of your live data settings window? Also - and I assume you checked this already - double check that the DPT message is selected in the message list drop-down menu (it is, by default).
It's odd that position would work and depth not. Are you running the latest version of ReefMaster? (1.8.35)
If everything else looks in order, it might be useful to look at a log of some of your raw NMEA data - could you send one over to This email address is being protected from spambots. You need JavaScript enabled to view it. ?

I posted a screen shot of my live data window. I attempted various combinations of the DPT and DBT checkboxes in that window each combination showed no change in program behavior ("D" in the DATA area of the main window remained red when the live view settings dialog was closed. My program version is says 1.8. I don't know how to check the minor revision but check for updates says I'm up-to-date.

Unfortunately I cannot pull a NMEA log at this time because that boat is currently being operated away from me. I can record a log when the boat returns tonight.

I tried the same program and laptop but connected to a Furuno Navnet 2 and RM seems to work fine. I've saved a few seconds of NMEA log from there so I can compare.

I observed in the NMEA logs that our chartplotter transmits an SSDPT sentence to communicate depth. My conclusion is that RM is not programmed to parse the SSDPT sentence and consequently does not consume the depth data. Our chartplotter does not transmit GPDBT sentence.

$SDDPT,4.6,0.0,*79

Thanks - I'll look into it. From memory, RM actually ignores the manufacturer code at the beginning (first two chars), so it should handle the DPT sentence. If you could send a log through, that would be useful.

I've looked into it a little more, and SD is the talker code for Sounder Depth and is supported by RM. Do you know which version of NMEA your unit is producing?
The trailing comma for your DPT sentence looks a little suspicious to me, and I am wondering whether this might be the issue. It could be that we need to update our NMEA support.

Here is a log containing the SD sentence. Note that I have edited it to separate out the SD sentence.

I'll try to determine the plotter's NMEA version.

Here is a DPT sentence from a chartplotter that is talking to our RM

$GPDPT,3.4,0.0,*7C

This looks formatted exactly like the SD sentence above. However, this chartplotter will also output GPDBT sentences like this

$GPDBT,11.3,f,3.5,M,1.9,F*3B

...as you know RM can be configured to look for either or both of GPDBT, GPDPT...

I guess one experiment I can do is hook RM to this charplotter and fiddle with these checkbox configurations.

What about the checksum? How do we check the checksum?

Thanks for the log, I will take a look.
You can try this online checksum calculator. I did run your example sentence through it before, and the checksum is correct (I doubt that this would be wrong, or the messages wouldn't work anywhere).
Can you confirm that you are running the latest version of RM? (1.8.35)

I have not been able to find the version within the RM program. However, RM "check for updates" tool reports I am up to date.

OK, it looks like the trailing comma is the issue, and there is a version of the DPT message that includes it. We will issue an update to RM that will fix this issue. In the meantime is it possible for you to use DBT?

Matt - can we resume this discussion? Any details I have are above. I do not have anything new to add. Last we left off is you were going to look into RM's interop with various NMEA versions. I was to attempt to determine our chartplotter's (a Lowrance HDS7 Gen2 with StructureScan) NMEA version. I have not made this determination yet. However, this boat should be in the afternoon. I would have an opportunity to take a look then.

I know the issue now, and we will release an update shortly to address it. Were you able to use DBT in the mean time, or is this now preventing you from using RM? I believe that you shouldn't get this issue with DBT.