Thanks to all that have replied. I would like the 66sr but it's over $100 more than the 65s and 66s (which are both priced the same).
If there was GPS funding assistance for retired and disabled people, I would be in line! LoL!!
Anyhow, the functions of the 66s appear to outweigh the accuracy of the 65s.
BTW: I informally tested both models next to each other by a window in my house. Set them both to plain GPS with no multi bands, etc. I was surprised that the 66s shows a lot more GPS satellites as compared to the 65s. (I wonder why that happened. Couldn't just be the screen size?)
Yes, the 66s takes several seconds longer to settle on the location than the 65s but both were easily within a foot or so of each other. However, altitude shows a 20-50 foot difference between the two units that are resting next to each other.
Obviously, setting the 65s to full multi band gets faster location within 4-6 feet as compared to the 66s.
I'm just pointing out the differences when both are set the same.
Perhaps, I should go with the 66s, because of the additional functions that the 65s doesn't have, purchase a route able topo map (which the 65s has and the 66s doesn't) and bide my time for when Garmin offers a greater variety of multi-band gps devices?
Opinions or observations?