The olde original G1 ATN thermals are the only ones worth having. I have an ODIN from that generation and while its been surpassed by critters like the Patrol, I ran the ODIN on my head for 2 years and would use it again. I couldn't sell it for what its worth to me. So I keep it and even use it now and then to make sure it still works.
So, general tips and tricks, same as any thermal. Adjust the brightness and match to the conditions. Invert between white hot and black hot to to see which gives you the best image for the conditions and be prepared to invert back and forth if you are unsure about PID. Sometimes the black or white will give you a little different look than the other. So if in doubt I invert.
And nuc the sh^t out of it.
The ODIN does not have a manual focus, but I think the Thor's do, so make sure to focus also.
So in general play with the controls to optimize your image and when in doubt nuc, so you don't wish you had when you have a yote in sight.
You might want to zero at 50 yds ... which depending on your gun will give you a double zero around 200yds ... which will give you a PBR between those distances at least, which is probably the distance you'll get most of your yotes.
These units are long out of warranty and I don't think ATN will repair them any more. So, use 'em till they break and then toss 'em in the trash as far as I know. But my ODIN still works and I plan to use it until it doesn't!