I bought this unit as an upgrade to my old trusty GPS3+. The internal entena is an order of magnitude better than my old unit and will find sats even in tree cover. The speed of the unit finding sats has been inproved as well. (25% redution) I use this unit for geochashing, auto navigation and boating. The tide chart is hiding in the "find" manu under "marine" BTW. The GUI is intuative and I never even read the manual. I bought a 2GB expansion card and have yet to be able to fill it. I have found it to be a joy to own. PS the compass needs the unit to be horizontal for it to work well. I leave it off as it spends most of it's time upright in the cradle. (Auto nav kit) If the screen were bigger and it talked there would be no reason to buy anything else in my oppinion.
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