Do you not have them in a unit of some sort? There is a sticky above (I have not looked at it) that looks like it would help you out on the conversion, but you may have to be able to upload them into a program for the process.
Update: Go to gpsbabel. They have input and output choices for Lowrance and H'bird files. You could try entering your points there right out of your spreadsheet. I don't know if it will work that way, but it couldn't hurt to try it. You may have to download your points off your Lowrance onto a flash drive and go from there.


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