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I've seen the palm unit with the marine charts but have not used it.
As far as the most cost effective unit for street nav, I bet a dedicated garmin street unit is proably the best way to go. But if you want schedules and address reference as time tracking then the palm is probably the way to go.
As for differeneces in the handheld vs the PC, as far as the Mapsend goes they seem to work the same pretty much. I have noticed some features that are lacking between the mapsend vs a better street program like delome though.
But this added capability to my handheld gps is nice, Also it makes good use of the sd memory slot ...I had 64 mb card with a handfull of tracks, routes and waypoints...Now it has a ton of good stuff. I have been using it in the car the last week just around town...the instant street routing is kewl. I needed to go to a hotel I have never heard of...I did a search for hotels near my area, a list came up sorted by distace from where I am, I saw the name, selected it and it gave me the address, phone , latlon, ect...one push of the goto button and route is created from where you are to the hotel. When a turn is comming up it beeps faster and faster as you approach it. when you turn the beep stops until the next turn. It is pretty slick.
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