Based on the available information, there doesn't appear to be a direct way to customize the speed of the Travelapse video on the Garmin DriveAssist 51. The Travelapse feature is designed to work automatically, adjusting its capture rate based on the length of your trip. Here are the key points about how Travelapse works:
1. Automatic adjustment: The feature varies the capture rate automatically based on the length of your route and the available space on your memory card[1][5].
2. Fast-motion video: Travelapse creates a fast-motion video of your trip, allowing you to share a short video summary of all the places you traveled[4][5].
3. Automatic or manual recording: You can set Travelapse to record automatically for longer routes (two hours or more) or start and stop the recording manually[2][3].
4. Continuous dash cam recording: While Travelapse is recording, the device continues to record regular dash cam footage[3].
The automatic adjustment of the capture rate suggests that the speed of the resulting video is predetermined by the device based on the trip's duration and storage constraints. There's no mention of user-adjustable settings for video speed in the available documentation.
If you want more control over the video's speed or other aspects, you might need to use the raw footage and edit it using separate video editing software on a computer. The Garmin DriveAssist 51 allows you to access the videos and photos stored on its memory card when connected to a computer[5].
Citations:[1] https://support.garmin.com/en-US/?faq=oY5JlRGjWE008YoYBRH9o7
[2] https://www8.garmin.com/manuals/webhelp/driveassist51/EN-US/GUID-24C0538B-F20A-4145-AC5D-638382B23294.html
[3] https://www8.garmin.com/manuals/webhelp/driveassist51/EN-US/GUID-24C0538B-F20A-4145-AC5D-638382B23294.html?rand=0.5423163361847401
[4] https://www8.garmin.com/manuals/webhelp/driveassist51/EN-GB/GUID-2B24464E-9549-427A-B06E-3AD80F9B4B25.html
[5] https://www8.garmin.com/manuals/webhelp/driveassist51/EN-US/DriveAssist_51_OM_WebHelp_EN-US.pdf