QUOTE(ucop27 @ Mar 17 2008, 11:17 PM)

You can use batteries, you just need to use lithium batteries, they are made to work in the cold. I use a Map76csx with a 2g sd card, I like it alot better than my old 76c, it acquires satellites alot quicker than the 76c. I use lithium batteries and can get alot of trips out of them, probably use 3 sets of batteries a year.
Garmin 60CSx w/lithium batteries and the Topo US 2008 map software, you can run it off sleds power and when sled is shut off the units battery power takes over and in batt. saver mode it claims 30hr on regular alkaline batts. so you can expect at least 45hr minimum on one set of lithium batt. if not 60hr & the ram mount is second to none--best out there. 60CSx is color and 100% submersible waterproof and has small external antenna which will give you superior reception compared to the etrex series in heavy cover--plus allows you to expand memory with microSD memory card which is one of the cheaper cards on market. So for a few dollars more then the top of the line etrex series you get way more options and a unit that will not only do Woods Trails but City and Water/Ocean navigation so you will get year round use --- Hands down the most bang for the buck-- $269.95 + shipping on ebay so don't let Garmin sug. retail of $428.58 scare you ---
https://buy.garmin.com/shop/shop.do?cID=145&pID=310) and you'll be all set beyond your expectations. Here is 3 pages of input from when I went to buy mine and asked questions on Maine Sledder Forum its a good read.----
http://www.mainesledder.com/showthread.php?t=1101 --- Stay away from rechargeable batt. and stick to the lithiums -- Keep us posted