In my small survey boat with portable equipment I record only SS/DS and have no primary channel. I use only the Structurescan transducer.
At the moment, to import useable depth data I need to use the slg2txt.exe from the Lowrance Sonar Logviewer application. Doing this means that I dont have access to the sidescan and sonar data.

However I can uncheck the reference to the slg2txt file from the profile and import the sidescan and downscan channels, without any depth information.

The slant range correction works - so there is depth information available somewhere. Is there any way that this can be selected / displayed / used as an alternative to the primary channel ? (Maybe utilise slg2txt as well as the ss/ds import function ?)

T

Hi Trevor,
RM will use the lowest numbered available channel for depths. In your situation, it *should* be using the downscan channel (2), as primary (0) is not available. What is probably happening is that, for some reason, there are some pings from channel 0 and RM now considers this to be the primary for that track. I have seen this situation before..
Maybe we can do a more robust check on availability of channel data (i.e. at least a reasonable amount available before declaring it the primary), but since we will be overhauling things in that area anyway, to allow explicit use of any channel as primary, we might just leave it for now.
cheers,
Matt

Matt,

I can confirm that there are indeeed a small random scattering of pings from channel 0, even though it's not connected. There are probably about 10 - 20 appearing. This is what's causing the problem obviously.
As you say - a selector would be good, but I'll wait for V2.

T

For a while I was only using the structure scan transducer as I had damaged the skimmer (tore off the mount and the outboard ate it). During this time I still logged data on a few occasions and was able to upload this to RM to make maps.