You can use MacENC to setup the waypoints and routes and then export them to the Garmin.
I have a Garmin 541s that I bought in March 2010 and agree with many of the post here. There are times when it is spot on and there are times when it's not even close. Less the latter though and the problem is clearly that the charts are inaccurate.
Not really sure how to keep this device and its built-in charts up-to-date as there appears to be no mechanism to do this from Garmin.
Really do not like Garmin's Home Port application and prefer MacENC and the NOAA charts instead.
The most interesting use of the Garmin is it's track feature that I have used to follow a previous pass through an area. In the end, I really don't understand how to use all the features of the Garmin or it's just really limited for functions of storing and maintaing tracks.
I tried using Home Port to plan a trip and found that Active Captain and other online resources were much more valuable.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.