cvd28 navd88 other
The typical vertical adjustment system in Canada is cvd28.
cvd28: Refers to Canadian Vertical Datum 1928, a vertical adjustment system which uses Mean Sea Level from the 1920's.
navd88: Refers to North American Vertical Datum 1988, the vertical adjustment system using the new sea level datum from the 1980's. navd88 will redefine the heights of several hundred thousand benchmarks across North America.
other: Allows the specification of another vertical adjustment system.