Adjust a cheap button compass, with automatic magnetic declination.

Here we have the cheapest button compass from China, sold in a bag of 10. You can see that the red bezel is glued to a magnet with 2 pointers. The pointers should line up with the lines, but they probably don't.

10pcs Mini Plastic Survival Compasses Button Design Practical Guider Accurate Compass Camping Hiking Tool Outdoora

In this case, the magnet is off by about 15°. That sounds bad, right? But here's the good news: the magnetic declination at my location is also 15°—though probably in the opposite direction. Luckily, it’s easy to fix. If you need the display to rotate clockwise, simply rotate the magnet clockwise.

Use a compass app to confirm direction, calibrate the compass to either True North or Magnetic North for your specific location by rotating the magnet. If you travel somewhere with a different magnetic declination, no worries—you’ve got 10 of these compasses. Just scratch the correction (e.g., "15") onto the back with a nail. Once you’re satisfied with the adjustment, you can secure the magnet to the dial using a little superglue.

For the best results, choose the compass that spins most freely and stash it in your survival kit.

While this quick fix works, I highly recommend investing a bit more in a higher-quality compass for accuracy and reliability.

Pro tip: print out this guide and tuck it inside the lid of your survival tin. Place the button compass in the middle, and you’ll have a full-size bezel for reference.

Expand a small hammock tarp with a poncho.

 

A little bit exposed

You can get a fairly cheap hammock with a tarp that is comfortable and suitable for withstanding mild rain. In stormy horizontal rain, you will obviously get wet. But you can use your poncho to make one end waterproof. You can use the snap fasteners to seal up one end of the poncho. Use cord and tent pegs to secure the other end. 

The poncho keeps one end dry

If you have 2 ponchos you can cover both ends. If your poncho is big enough, you won't even need a tarp. Connect 2 identical ponchos with the snap fasteners. With British army ponchos that would give you a 9x6.7 foot sheet with grommets for person lines. That is slightly small though.

If you have 1 tarp and one poncho, you can use a garbage bag on the other end, perhaps cutting 1 corner off the bag to thread the webbing strap through.

You could probably use 2 garbage bags with no poncho, but I always bring a poncho.