Wow, some really good stuff in here. First thing I'd say is heed Nessmuk's post, he's obviously a seasoned B-whacker. I'd add a few points, if I may;
spencer said:
ALWAYS trust your compass. Do not rely on your GPS. Just use it for fun, additional information.
Don't go with someone who relies on a GPS.
By this advice, I assume you mean that you shouldn't leave the map & compass behind and rely solely on a GPS. I'd agree with that. That said, A GPS is neither a gimmick, or a toy. In the hands a competent and knowledgeable user, it can be a powerful and reliable navigational
AID. In fact, I'd say my "observational navigation" (ObNav) skills, which I would say are the most important ones to have, have increased dramatically since I started using a GPS unit. I too extensively pre-map before hiking and I would say I use ObNav as my primarily navigation while b-whacking with GPS secondary and M&C as my tied/true failsafe option. My GPS (an Extrex, with internal topo software loaded), when properly functioning, provides immediate feedback to me while using ObNAv. In the thick stuff that tends to push routes left or right, it can help ward of the enemies of whackers like mapbending (A HUGE ONE) and the others Nassmuk mentioned. Not looking to start a debate on the issue, but a GPS unit can, and does serve as more than the gimmick item. Is it a dependable as M&C? No, but in my experience (Adirondacks), it's pretty good.
Okay, I know I've used my two cents already, but I'll add a couple items (mostly outside navigation) of practical value that may be more obvious but sometimes overlooked by beginners.
- Time - When planning a bushwhack, DO NOT forget to take into account how much slower whack travel is than trail travel. When pre-mapping and plotting mental waypoints, understand that two streams 1/2 mile apart that may take 15-20 minutes along a good trail can take up to 1 to 1 1/4 hours in dense conifer brush. Don't make the error of assuming that "I'll reach the next stream in 20-25 minutes" before you know the "conditions" between the two points. Otherwise, in about 45-50 minutes, you'll start to wonder crazy things like "I wonder if that puddle back there was the stream I wanted, maybe I should go back" As others have said, once the mental mindgames start, panic sets in and you start "bending" the map to your "perceived reality" not your actual one.
- Flexability (slight adjustments) - Some streams are plesant babbling brooks straight from Cinderella's woods and some are choked with blowdown and are a hidden jumble of holes, rocks & hidden hazzard that will slow travel to a crawl and are really not safe. Likewise, some ridges are open strolls, while others are wind collectors that serve to create acres of horizontal forests. Don't be afraid to drop off a ridge or pull way up stream bank in or to slightly adjust the route for easier/safer travel, just know to make the mental adjustments. If safer travel calls for you to get out of the brook and travel next to it, but a hundred feet away or so, do it. Hazzards found in the woods magnify on a bushwhack. You may have planned to "take the brook", but have the flexability to move to safer travel, if those options exist. THIS DOES NOT MEAN ALTER YOUR ROUTE ALTOGETHER.
- Footing - Unlike trails, which (for the most part) have predictable and decent footing, the forest floor is a tangled mass of compose and is fraught with hidden traps, false floors and other femur eating craters willing to injure and maim the careless foot placement, particularly on sloped terrain. Make sure what you are putting your weight on is real, particularly if your 190-200# (like me) or more.
- Extra items - Hats (ball cap), and glasses (which I only use in the real thick stuff). A corneal abrasion far from help in dense woods is "no joke". Myself, I prefer long pants and shirts for reasons mentions by Spencer. Also, gloves can help, even the cheap $3 knit jobbers. Yours hands esp. take a beating b-whacking.
- Getting Wet - Bring extra clothes in WP containers (bag). You may wake up and find okay weather and say it's a good day for hiking, but remember, if it rained overnight or if lots of condensation is on the trees, YOU WILL GET REAL WET on a bushwhack. Triply important in cool temps and a breeze. I've gotten REAL COLD, REAL FAST on cool summer b-whacks that I really did not thick I had to worry about beforehand.
- Treking poles - Unless you know your gonna spend the majority of the day in open woods, loss the poles....... B-whacking on steep terrain is a "hands on" sport. Also, if someone in your party refuses to heed this sage advice, give them a wide berth, I can't tell you the number of time Peakbagr has almost killed me with his this summer**
** - {edited}
Partially kidding on this one. I'm teasing Peakbagr, and this is certainly "not the biggest issue" out there. Still, most people I know that have taken poles on whacks regret it at some point. They value they serve along trails is somewhat negated in dense brush.
I could go on, but I've babbled on long enough.