Summary: I have been searching for a handheld chartplotter where you can string a series of waypoints on the chart and create a route. The Garmins (Colorado and now Oregon) don't do it, you have to set waypoints then select them from an off chart list to create a route.
Yes, for more details you have to buy a chip. A great marine chip for this unit is the Nautic Path which can be found on Amazon for $119.
Summary: I have had this unit for about 18 months but have used it only 6-8 times - never in foul weather. It worked fine at first - with TOPO downloaded maps onto the MMC card and a Navionics card for marine use. Always locked on fairly quickly. Displayed maps beautifully. Now, after not using it for about 4 months (the batteries removed for safe storage) the unit will not lock onto satellites regardless of how long it's left on or despite performing soft and hard resets.
Summary: We purchased the Lowrance iFinder H2Oc GPS with some Navionics maps on an SD memory card. We used new Lithium AA batteries with the unit.
Our purpose for purchasing the unit was for use in navigating waterways
between Minnesota and Ontario, specifically the Rainy Lake region.
The unit worked very well, and was very useful for navigating these rocky lakes, with many navigational hazards, such as numerous rock outcroppings, and hazards just below the surface of the lake.
Summary: This Lowrance GPS receiver has all the features needed for geocaching. Aided by topo mapping software, this device will lead you to any spot you want. To get the same features in other brands, you would have to spend more money. Also, the car adapter comes with the device whereas it is a separate purchase in other brands. We have used it extensively and never had a problem.