Welcome to the first fully functional electronic logbook on the iPhone/3G iPad/4G. Driver with an iPhone or iPad: This app is all about the Canadian driver. iDDL is based on the US Standard HOS rule for the North American Standard. iDDL collects, records and processes your Hours Of Duty Service, and Inspection information. Once the data is collected, iDDL will calculate your Hours Of Service (HOS) to FMCSA requirements and display these back to the driver.