Orsonab said:
I apologise if this seems a silly question but what kind of tips and knowledge are useful if one is contemplating a bushwhack? Obviously, one must be well-versed in map & compass technique but I'm curious what other knowledge when choosing a route would be useful?Thanks
I could write a book on this topic, but here is a small subset of tips in addition to those others have given (assumes traditional map and compass with NO GPS):
- Map study before you go is crucial. After years of bushwhacking I still spend literally hours at home pouring over the map on a long route, covering every detail of every step of the way. I don't carry an extra map, but I study key features well enough to be able to find my way out without the map even if both of my spare compasses fail (I usually carry 2 primary and a smaller third compass, cheap and light insurance). Learn "observational navigation" techniques of the terrain.
- Don't "bend the map". This is when you force your perceived location to be where you think you ought to be, not where the navigational clues say you must (or must not) be. The temptation can be surprisingly overwhelming, especially when you get tired at the end of the day. You tend to ignore certain features and emphasize others in your head, and begin to think "the map must be wrong". Believe what you see, make sense of what you see. Relate that to the map and justify everything. Rationalization is ok if you can justify it entirely, not just certain aspects. Cliffs and ravines do not just dissappear or appear on a map and not be rooted in reality, even if that nearby pond looks correct. On the other hand, the small stream you just crossed may indeed not be on the map and beavers do change the landscape. Consider the last update year of the map in this process.
- Always continuously keep track of your time and direction for dead reckoning navigation. Try to find key "waypoints" spaced by 20-30 minutes during your pre-trip map study. If you have to change course from a straight line to find a suitable waypoint, oh well, that's part of the game and well worth it. A waypoint can be as simple as a change in slope, a slight bend in a stream, or a squiggle in a contour line, anything that changes. "Change" is your navigation friend. Reasonably varied terrain creates a succession of contiguous waypoints, and precision is as exact as map resolution and your experience let it be. Expect to be at your distant waypoint on time unless you can justify why not... which often happens. Dead reckoning is a dynamic process subject to constant realistic revision as you travel and your predicted speed changes. More often than not, if you "arrive" in 12 minutes instead of the planned 20 minutes then you are not at the right point. If you have walked for 25 minutes but expected to be at the pond in 15, something is seriously wrong. Figure out why
before compounding your error, the single greatest reason for becoming "lost".
- Travel along "handrails". If you can easily follow or parallel at some distance offset to a stream or a ridge or a ravine, do it. It becomes your handrail and should lead you to your next planned navigation fix point.
- Have a "backstop" in mind. If you miss a point and go too far, how will you know? Try to choose a waypoint such that if you go too far what you encounter beyond will be obvious and you can't miss it, because of the high ridge or stream or whatever broadly crossing your path.
- Offset your course to locate a small point on a linear feature, say a hotspot fishing hole in a stream. Intentionally head left or right of the intended point, to miss it by a small distance. When you reach the stream, you will then know whether to turn left or right instead of guessing. How far to miss? Experience will tell you the limits of your navigation accuracy.
- Beware of ghost trails, unmarked trails or old log skidder roads that temptingly "almost" go in the direction you intend. Often navigation is tougher because visibility may be reduced due to extra vegetation growth along the edges of the trail, and you tend to let the trail do the work of navigation rather than pay as much attention as you should. Before you know it you have wandered far away from your intended direction and you have lost track of how far.
- Observe, observe, observe. Look for any terrain change to help you. Justify everything you see, let nature talk to you - she has plenty to say. Turn to look behind often to get that view as well, especially at junctions or direction change points. Note any odd looking feature, plot it on the map and in your head.
- Finally, of course let significant others and local rangers know of your plan, and stick to the plan!