What if I am a returning umpire or qualified overseas?

Cricket Canada's Umpiring Examination Guidelines (cricketcanada.org) set these rules:

Returning or inactive umpires

• Inactive for 3 to 5 years: a refresher course is required.
• Inactive for 6 or more years: you must rewrite the exam, pass the on-field assessment and pass the viva.

Overseas qualifications

• Fully qualified umpires from full ICC member countries must pass the Cricket Canada Qualified Umpire exam.
• Partially qualified umpires from full member countries must write the Intermediate Umpire exam.
• Umpires from non-full-member countries are assessed individually by the National Committee for Umpires.

Regional contacts listed by Cricket Canada

• Eastern Canada: Rohan Shah, umpirerohan@outlook.com
• British Columbia: Harry Grewal, harry@thegrewals.ca
• Prairies: Amol Bhatt, umpire4cricket@gmail.com

Source: https://cricketcanada.org/cricket-canada-officials-sub1/