Thank you for providing your XLSForm, Ben.
You appear to be encountering an issue that is related to the 'repeat_count' values that you have assigned to your repeats that contain geopoint questions.
As a workaround to the issue, you can remove the repeat count values, and republish the survey. You should then be able to successfully 'Send Now' at the end of your survey. I have gone ahead and added a note to the issue that has already been documented for fix in a future release.
Brandon