Welcome to the forum. Some of the newer folders have folding mechanisms with various synthetic bearings or surfaces. You can actually damage these with lubricants. My Fallkniven U2 folder is an example. If it's a stainless blade a little clean water and drying is sufficient. My pockets accumulate debri that makes sharpening dust look pathetic. Magnetic field maps are a good idea. I also make an impromptu field map and notes in any new area. Topos can be terribly out of date and to a novice ( or even a very tired experienced navigator) look like so much spaghetti. The human mind creates a mental template of it's environment constantly. Has anyone driven home and can't remember the drive? My stretch of the California Coast is on a W/E axis. Yet the Pacific Coast Highway to me is either N for San Francisco or S for San Diego. This is allright, until the drive in movie screen you saw tastefully painted in 1957 is being bulldozed in 1997 <img src="/images/graemlins/blush.gif" alt="" />. it's embarressing having to ask a vietnamese gas station owner for directions where you grew up <img src="/images/graemlins/confused.gif" alt="" />