GPS 2009 LakeMaster® ProMap Minnesota Card

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I don't upgrade my cartography. I'm still using 1999 and that is based on USGS from the 70's. I update my paper charts with "Notice To Mariners"  once a year (it's monthly) and ask locals if any "Aids to Navigation" have been changed or lost in storms before I cast off. They usually have the best information. Sand bars move way too much to trust anything but a keel to tell you the depth. (Black River Harbor)

I transfer my fix to paper and keep deck logs (heading, bearing, avg speed, wind, lat., lon., waves) about every hour or course change. I plot on my charts with soft pencil and make notes of hazards. I have a historic record going back 10 years on one chart. I wouldn't upgrade it.