Spotted briefly by itself before disappearing. between 500-1000 m from boat.
No interactions present.
I have to agree with Gill from the photo evidence you can not tell which cetacean this is, I presume you saw more than is captured in the photo to suggest killer whale. It could be a killer whale but it could be other cetaceans as well.
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Lat/Lng: 57.073589, -6.855469
OS grid ref: NG058085
Spotted durring Oban to Lochboisdale ferry crossing.