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Discussion Starter · #1 ·
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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