I am an 18x hopeful, and have been practicing land nav skills with my local Orienteering club. The compasses we use there are small and clear, and meant to be laid on top of the map. It is my understanding that the Army uses lensatic compasses, which don't seem to be used in the same manner. Should I switch to using a lensatic compass on the courses, and if so, what are some features in a compass I should look for?