Here are some late ideas. We are focused on GPS and LiDAR so be thinking of how you could incorporate either a satellite emblem or something to do with laser light.
#2- I really like the pushpin idea but it creates too much of a "basic" feel for a company working for Engineers. This would be better for someone doing site selection or more of a broad GIS services approach. We are focused on the engineering / high precision GPS applications.
#3- this is too "flowery" or "happy day" looking.
Some more ideas that I found to spur on more creativity....
http://www.demossdesigns.com/art/main/_samples/logos/allDDLogos.jpg#2 thru #10 could use a little bit more color.
#17- make sure the "C" is legible with the name. We have had people mistake our name for "loudpoint" before.
#23- try to make the emblem look a little bit more like a compass. right now it looks like a gear.