A-23, r. 10 - Regulation respecting standards of practice for location certificates

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6. The results of the survey operations shall be confirmed by an additional source of information duly identified and kept in the record, in particular by using any of the following methods: measurement by repetition, data cross-checking, different ties to fixed positions, searches or a previous or concomitant survey plan.
O.C. 1058-2002, s. 6.