You're in a very bad spot, so you should do your best in avoiding detection. Keep heading towards your destination and make sure that you're using camouflage all the time. Use some of the nearby rocks (screen) for cover. Lay down on the ground and recharge your armor there. You should be fine, as long as you stay away from enemy troops.
You should be able to leave the endangered area in a few seconds and eventually you'll come across a small path (screen). Keep heading north and make sure that you're using camouflage all the time. Notice that you're getting closer to your current destination. Once again, you'll have to plan your next moves before going there.
You can approach the crash site from several different angles. I wouldn't recommend choosing the burning passageway which is located to the north-east. The main reason is that you would be exposed to enemy fire. Instead, turn left and drop down with a little help from maximum strength feature. Notice a small river here (screen).
Worst case scenario is that you'll encounter one enemy unit here, so it's very easy to get rid of this threat. Eventually you should be able to find a small path which leads directly to the crash site (screen). It's very important that you save your current progress here. Approach the plane very carefully. Take cover near the rocks and wait for suit to regenerate itself.
Sadly, reaching the camera without killing anyone is next to impossible, especially since the object you're looking for isn't located inside the plane. As a result, you must consider taking out at least a few soldiers. There's also a possibility that your attacks may attract attention of other soldiers from this area. Try killing them one at a time and use your cloaking device properly to avoid detection for as long as possible. If you have nothing against a more direct approach, use more powerful guns and grenades (screen).
Make sure that you've killed all soldiers near the plane. Check the areas to the south and to the west, because there may be additional patrols heading your way. Take your time to collect weapons and ammunition, especially since there is a small stash near the plane. Once you're ready, approach your target (screen) and press the action key. Wait for new orders.