I recently got a new to me 987c SI Humminbird finder and tried to make my first recording the other day. I have a 32GB SDHC card as well as Navionics Gold Great Lakes chip card.
When trying to do my first recording, went to the recording view and started the recording. Proceeded to fish for several hours and the "RECORDING" message came up all the time so it appeared everything was working without issue.
After about 4hrs, the fish finder shut down. I powered up again, and assumed the SD card had been filled. When I got home, loaded the SD card into my PC and went to the RECORD folder and RECORD001.dat was only 1KB? I put it back into the finder and tried to replay and it didn't play anything back. It would open the recording without issue and show an initial depth of 26ft but that's it, no more data.
Any thoughts on what I did wrong here? Newbie so not sure how to troubleshoot this stuff.