Not true. the eTrex 20 provides this - for less that $200, and 1.5 oz heavier than an 800. It's what (very) long distance riders use, because the AA batteries can be replaced any time / any place. The 500 & 800 batteries last less than 24 hours, and would not work on a decent brevet ride.



So - it depends on what kind of riding you'll be doing.