Continuing my series on our upcoming search for a downed Douglas B-18 bomber in Alaska<sup>*</sup> (13 more days to go!), I've started to think about the angle we should use to "look down" at the terrain.  This is especially important because I will be mounting go-pro like cameras on the airplane to capture what we "see" on the ground as we go.  I will do this with this handy [tie-down mount](http://www.mypilotstore.com/MyPilotStore/sep/11254) I came across:

[![enter image description here][1]][1]

This mount allows the camera's to be positioned at any downward angle.  I wouldn't think that either straight down or straight ahead would be optimum...I would assume a good angle would be somewhere in between.

Obviously this question has some relation to photography, and I may also post this question to [Photography.SE](https://photo.stackexchange.com/).  However, I would also assume there are a great number of pilots or other professionals with experience searching from airplanes/helicopters for things on the ground.

So my question is, _what is the best angle (relative to straight ahead) to search for something on the ground._

Keep in mind that I will be searching over glaciers around an active volcano in partially snow covered terrain.


<sub>* Related posts: 
[Where can I find more information about my grandfather's crashed B-18a bomber on Mt. Redoubt Alaska?](https://aviation.stackexchange.com/questions/38988/where-can-i-find-more-information-about-my-grandfathers-crashed-b-18a-bomber-on) and 
[What navigational aid(s) would WWII bomber pilots have used while flying in instrument conditions?](https://aviation.stackexchange.com/questions/42792/what-navigational-aids-would-wwii-bomber-pilots-have-used-while-flying-in-inst)
</sub>


  [1]: https://i.sstatic.net/tgrqo.jpg