Noted here as well on the SDR recording. Heard some CW mix in with audio.
The transmissions were very 6 minutes starting on exactly the minute (or within a second or two) and ran for 90 seconds. Starting at 0115z, then 0121z, etc until the last transmission at 0227z.
No idea what this is. I was first going to say pescadores, but it doesn't seem to fit their MO. Nor the average pirate. There is a lot of oddball gov/quasi-gov stuff in the 69xx range, so I am leaning towards that.
Any other ideas?