I have recently purchased ReefMaster to delete all my duplicated marks...
I had 1005 double ups which after I deleted them
I saved it back to a SD card in the same format as my Lowrance saves (usr)

When I import them back on my
Lowrance HDS live 9
It gets to 96% then freezers I have to unplug it at power to fix it

Retried hole process again on reefmaster opened my file imported them deleted the double ups re saved as a new file on my SD card
Inserted back in my Live unit and this time got to 97% imported and froze my unit

New to reefmaster but I do understand the concept as have done similar years ago with GPS Bable on a Garmin unit...

Help needed

Thanks for the report - I don't think this issue has come up before for the WM.
Which version USR did you export from the Waypoint Manager, and do you know which version you exported from your HDS?
Did you delete waypoints on the HDS before reimporting your updated file? (I don't know if this would effect things, but might be useful info for me).
Are you willing to share your original and updated USR files so that I can take a look? Discretion assured, of course, you can mail to This email address is being protected from spambots. You need JavaScript enabled to view it. .

Whilst we try to understand what is going on with this file, you might be able to get your waypoints back into your HDS by exporting from the WM in either GPX or a different USR version. I would suggest anything USR 4 or later.