If $ is an object Garmin 48 a good choice
The 48 has proven itself over time and has a large cadre of loyal followers, as some of the posts here demonstrate. If you can pick one up for a product discontinued sale of $150 it's hard to beat. The 76 is the newer version, and is a WAAS receiver, which means its accurate to about 10' instead of 30'. If that kind of accuracy is important to you (and its hard to see why it would be) then spend the extra $75 for the 76. The etrex is probably fine, it will give you same basic info. Given the choice I'd buy the 48 (I did actually) over the etrex, basically because its a marine unit which has proven itself over time.Garmin has a good rep for customer service. I had a 12 that stopped working which they replaced for free, even though I was a few months past warranty.I didn't buy a Magellan, b/c I didn't think the screen fonts were as easy to read. The chartplotters are fun to play with if you are willing to invest a few extra hundred bucks. Basically, they save you from having to plot your position on a chart, and calculate distance and direction. However, as everyone points out, you need paper charts and these skills anyway, unless you think sailing chartless is a fun challenge when you GPS goes down. When my GPS stopped working in Bimini, you bet I was glad to have my charts and know-how to plot a course back home. IMO, a chartplotter is a fun toy, but is not necessary for safe navigation.