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GPS mapping and lake countour ?????????

1034 Views 3 Replies 4 Participants Last post by  Steven M.
I currently use a Madgellen 310. It has been very reliable and accurate for me.
I want to upgrade to a unit with mapping and lake contour features. Do I just buy and install these features or is this like a subscription where I have to pay an annual fee to use them?
If you have one that you like I would appreciate your feedback on how well it works.
Thanks in advance for help.
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I once went on a friend of a friends boat a while back and he had a setup from hummingbird

http://www.humminbird.com/Category/Technology/LakeMaster-PLUS/
I have a Garmin 60CSx handheld GPS. There is no yearly fee once you buy the maps.
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