I played The Division and got to level 30 playing normally.
I noticed when I reached level 30 that intel I collected now gave 110,000 xp, not the 330 xp I had been getting beforehand?

I started a new character to test this theory and have wandered the maps completing missions without collecting any intel if I can help it.

I reached level 30 on the new cahracter and started going round collecting the intel now showing in all areas of the completed map.

It works out at around roughly 4 or 5 items of intel for each field cache box. There are over 160 phone recordings. Thats over 32 cache boxes just from phones.

In less than an hour I collected 8 field cache boxes. My new level 30 now has far more elite weapons and armour than my first level 30 character.

Ideal if you want lots of hax weapons, personally, I kept the best gear and weapons and sold the rest.

I found it a good way to massively increase your credits and get some very nice weapons and gear