Well the company I work for pays all it's expats in US dollars. There are about 15 different nationalities, so you can imaging the fluctuations in all the foreign currencies. Company gave us all a base line for our local currency against the US and when the currency fluctuates we get paid more. Eg the Canadian or the Aussie dollar is strengthening against the USD so we get paid more last month I pulled an extra $2500 on my Salary. belive me all the crews are happy about our currency protection. Should the Aussie or Canadian dollar drop against the USD well then we still win as we get more money due to the exchange rate. so you see it is a win win situation.
I am sure your union rep can get CHC GO to arrange currency protection for all your foreign nationals. The Canadians might want to get a better basic by taking a look at the European wages and get CHC to match them. Price of oil is going to go up again and BC will want to get his calculator out again