Get 800 Ah or 850 Ah batteries and it is an excellent trip logger with 10 hours tracking time with minimal intervals of 1 point per second..
I use the nickel metal hydride AA batteries. You can find them at walmart. I have 2300mah. They will last twice as long as any alkaline batts. They don't have to be discharged to recharge (no memory effect). They pay for themselves in a month and I've been using the same ones for over two years. Be careful to look for the milli amphere hour rating of the batteries. The 2300 is the largest I've found so far.
