The simplest approach is to keep both your camera and GPS logger on one fixed time standard, such as GMT/UTC, for the whole trip and avoid changing them as you travel. That gives you one consistent timeline for matching photos to GPS logs later.

If your camera and logger aren’t perfectly synchronized, geotagging tools can usually apply a constant offset in hours, minutes, or seconds. Aperture generally expects some offset, so a consistent difference is manageable.

If you do change time zones, it can help to import photos from each time zone separately and adjust each batch as needed.

Also keep in mind that geotagging often still needs some manual cleanup because of camera clock drift, GPS inaccuracies, and photos taken indoors. To reduce the work, geotag as soon as possible during the trip if you can—daily geotagging on a laptop is easier than sorting everything out after you get home.