Half of my DH's ashes are scattered at sea, and half at his favourite place in the Lake District. I asked permission from the cruise company, which was freely given, and when I got on board contacted the chaplain who arranged evetything. There was a lovely little service, (just me, the chaplain and the ship safety team). We had to wear lifejackets as we were by an open door near the water-line! It was beautiful and I felt DH would have been pleased - he loved the sea, was a highly qualified sub-aqua diver, also an ocean yacht master, and absolute loved cruising, as he was on his beloved sea. After the ceremony I went up to a bar on deck, and raised a glass of Prosecco to his memory. So he is somewhere in the Baltic!
The remaining ashes went with me and immediate family to the Lake District where we rented a cottage for the week, found his favourite lake and scattered the ashes in a remote spot.