Hi Ian , if memory serves me correct, you can either:
Use the Navlink software to download the sbp file to your pc, or
Put the memory card in and use the GT31 menu options to "Save to Card" , the sbp file will then be saved from the GT31's internal memory to the SD card.
not 100% sure, hopefully a.n. other will verify / clarify the above
cheers
H
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