I'm don't know much about the Nor Mark brand, but I can recommend Silva. They have a model 424 that is just big enough to see well but small enough not to be in the way. They are built well and last a lifetime. I use one of the 424's and the explorer baseplate models for orienteering. If your interested, you can contact them at (800) 263-6390 for a catalog marketed by Johnson Outdoors, Burllington, Ontario, Canada or on the web at WWW.silvacompass.com.