By "Garmin Navigator5" i think you're probably referring to the Garmin-made BMW Mottorrad Navigator V.
If so, the answer is generally yes you can place all detail mapping on an SD card but it won't make the navigation calculation or other tasks any "faster". Maybe you're meaning that the mapping is loaded faster to the card by GarminExpress but that's not so either. The base map (gmapbmap.img) and timezone map (gmaptz.img) must remain in the onboard .System folder.
Note that GE will decide if additional mapping and ancillary files should be placed on a media card based on available space in the onboard memory. It's best to just trust it's placement because moving detail maps to the card won't improve overall performance unless the internal memory is almost full.
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