Astronomy - Practical tips for night movement:
1. Be cognizant of your natural night vision (takes about 30 minutes for your eye's rods to generate maximum Visual Purple) and avoid erasing it by exposure to white light. If you just need a utility light to check something (compass, map, pack contents, etc.), try to use a filtered light. Red, green, or blue/green.
2. Protect your eyes. Wear goggles or wrap around glasses. Clear ballistic wear, shop goggles, ski goggles, dust goggles, handball goggles, sky-diving goggles, safety glasses, sport glasses. Try to use something with a head band that won't come off when you walk into a wait-a-minute vine, eye-ball high twig or branch, or even a wire.
3. Wear light gloves for gently moving thorny vines, tree branches, fencing, or other obstacles out of the way. Hold anything springy in place for the person walking behind you until he or she has a chance to grasp it for themselves. Nothing like pushing a dead branch out of the way and then allowing it to whip back into the face of the person behind you. "Buddy-" is only half a word...
4. Move slowly and deliberately, especially in pitch black forest and undergrowth. Feel the next place with your forward foot while keeping weight on your rear foot. You may not see that your next step is off the edge of an erosion gully, arroyo, boulder, or stump hole.
5. I was taught the following by a platoon sergeant who had been a Lettered Ranger Company recon guy in Vietnam. He showed me this technique while we were in the night jungles of Panama... and it works:
a) As you slowly move through a darkened landscape, glance down at the ground immediately in front of your feet.
b) From your boots, scan the ground ahead of you out to about 12 paces with just a glance.
c) Look back up at your direction of travel and continue to move. Your brain will absorb a "snapshot" of the footing and terrain you just scanned. You can then move without looking at the ground...your subconscious/short term memory will guide your feet without you having to look down continuously or think about exactly where to place them.
This technique is important if you have threats to your well being (like the possibility of being ambushed at any second). You need to be able to scan your surroundings without walking with your eyes glued to the ground. Again: Scan the ground from your feet out to 4 yards quickly (just a second or two)...and then get your eyes back up into the threat zone... and trust your feet.
6. When moving through thick stuff at night, bend low or squat briefly to look under vegetation. You'll often find clear tunnels of visibility and even horizon back lighting of breaks through the foliage. The same process that allows you to see objects or people silhouetted against a hilltop or horizon at night, will allow you to see under the vegetation as you get your eyes closer to the visual horizon.
7. Trip Wires (and wire fences) in the dark: Grab yourself a long (3-4 ft) strand of light, thin, and very flexible weed stalk, green branch tip, or tall grass stem, etc. and use it to sweep your path in a vertical motion. Hold it pointed in front of you like a dowsing rod and make gentle passes from ground level to just above head high. If there is a wire, the stalk will bend against it (without disturbing it) and you'll feel the resistance. You can do the same thing while wearing Night Vision Devices (which are notorious for failing to pick up tripwires or game fences).
8. If you believe there is a possibility of someone having emplaced IR security devices or beams in your path (across trails, gates, bridges, fence lines, or unattended structures) , any cheap Level 1 night vision monocular will detect beams or emitters.
9. If you have a Tritium compass like the OP (you do... don't you?), it can be used as a night signalling device. Especially good when you travel in a party and the first guy is picking a path through some particularly thick and dark obstacle. As he moves a few meters ahead and finds a way through, he can use the compass to signal everyone else forward...instead of everyone bunching up close behind him then getting stuck in the crap together.
The face of the compass can be moved vertically (up and down like a head nod) to indicate "Safe", "Clear", "Begin to Move", or "OK"... or horizontally (side to side like a head shake) to indicate "Danger", "Not Clear", "Halt", or "Not OK". Moving the glowing face of the compass in a circular motion could mean "Move to Me" or "I Found a Good Bivouac/Rest Halt Location Right Here". Same signals using any small flashlight, LED keychain light, etc.
10. Nicotine degrades your night vision. Just something to be aware of. Vitamin A deficiency also weakens your night vision.
11. Campfires absolutely kill your night vision. If you wander away from a fire into the dark, go slow and use a headlamp...or wait several minutes (5-10) facing away from the fire for your night vision to regenerate to minimally useful levels. If you are moving past or approaching folks gathered around a camp fire...they can't see you out there in the dark. Not until you get close enough to reflect light from the flames. They can see everything around the fire. They can make out almost nothing beyond the radius of the fire's light.
12. In a military or SHTF context...If you are suddenly illuminated by an aerial flare (pop-up or parachute flare up in the sky)...freeze. Someone is scanning the illuminated area from a distance and looking for movement. Any movement. If you suddenly get illuminated by a ground flare (the kind attached to the trip wire you just hit)...get out of the light and dive for cover. Ground flares are covered by fire and someone is about to fill that spot with bullets or grenades.
If you see headlights coming at you as you cross a road and you are just on the edge of the treeline, roadside brush, or ditch, move to closest cover or concealment if you have a few seconds. Other wise, slowly crouch down and freeze. Driver's eyes are focused on the cone of their headlight beams. They will usually miss you, even if you are exposed in the open, as long as you freeze. Close one or both of your eyes as the headlight beams come into your field of view. Don't stare at the lights...saving your night vision and avoiding reflection from your eyes. Human eyes don't have a reflective layer (like a cat or an owl), but they will still shine.
13. If you hear a droning propeller driven aircraft in the night sky and happen to look for it with that $100 Night Vision scope from Walmart...and see a giant spotlight beam of light coming down from the sky...and then don't see it with the naked eye...there is a gunship overhead sweeping for targets with an IR illuminator. If you are in the circle of IR light...you are about to be dead.
14. Your natural night vision is generated by chemical receptors that ring the back of your eye. You have a night vision blind spot in the center of your vision (which is where your daylight/color receptors are concentrated). If you stare into the darkness at a particular point, after a few seconds, you will start to see a dark blob in the center of your field of view. Knowing this, you can better "see" things in the dark by offsetting your vision. Don't stare directly at an object...place it within your peripheral vision instead. Look at it out of the "side" of your eye. You'll be amazed at the improvement.
15. Wide field of view binoculars work almost as well at night as they do in the day. They have the ability to gather available light and transmit it to your eyes in a manner that far surpasses your natural night vision. Carry a set of pocket binocs (or a monocular) if you anticipate needing to see things in the night.
16. A lit cigarette coal can be seen for several hundred yards at night. Through a night vision optic, it will look like a road flare or exposed flashlight (even when cupped in your hand). Something to think about if you are ever pulling a sentry shift. Do I need to mention lighters, flashlights, illuminated watch faces, & cell phone screens?
17. At night, ice fog, heavy rain, or heavy snowstorms defeat many thermal observation devices. Good time to move unobserved.
18. At night, distant lights appear closer than they actually are. Especially out in the desert or mountains. That lit radio tower on the horizon may be many miles farther away than you think. Check your map.
19. Use the offset method of utilizing peripheral vision while walking (even down open trails). You'll be able to see your best path ahead of you and avoid rocks, ruts, or areas that aren't clear.
20. If you see reflected eyes low to the ground, it's usually small critters (cats, coyotes, raccoons, wild pigs etc.). If up in the trees, it's usually an owl...or monkeys. If head high it's often deer. Sometimes a black bear standing up to get a look at you and sniff the air. If the eyes are above head high and circle around you without lowering occasionally...it's Sasquatch.
Hope some of the above helps someone...