ITC Data Book 5 has been formatted for the hunter and sportsman. Fully functional and can stand alone as your complete resource for your personal shooting habits and capabilities. Also very desirable as a necessary back-up to any down-loaded program utilized electronically. Smaller than a cell phone with the strongest and most reliable writing paper unique only to our ITC Data Books. This is the same Never-Tear paper I first used when conducting underwater dive operations in the SEAL Teams. Absolutely no match for any other kind of marketed waterproof paper.Absolutely no match for reliability and strength of any other kind of marketed waterproof paper like Rite in the Rain or TYVEX, guaranteed!