You can use a regular SD card up to 32 GB for the HDS units....you can get a 4 GB for cheap and will be plenty.....as for your coordinates, you can save them to the card BUT they must be in the correct format for the unit to import them.....which the file extension is *.usr....there are a few ways to do this....assuming there are not a lot of wp's, you can manually enter them into the unit or use the free program from Lowrance, it's very basic but allows you to plug in your numbers at the pc, save the file and then copy to your card to import to unit. Also can be done with google earth, just enter the info, then save the kmz file out and then convert it over to a lowrance file with a 3rd party program like GPS Babel.....the first two i suggested is the easiest......when you place the card in the unit, it will NOT transfer them automatically...you must manually import the file....the unit does not "read" the wp's from the card and display them....it actually stores the wp's in the unit's memory....so after that you can remove the card. Also a common mistake some make is they put the wp's into one coordinate format and then forget to change to that format on the unit when uploading and they wp's are not in the right place...so if you input the wp's in decimal degrees, make sure the unit is set to the same format for reading....


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