If an admeasurer is assigned to measure or certify the tonnage of a vessel at the request of the owner thereof at a place other than a port of entry, a custom station, or port where an officer-in-charge, marine inspection, is located, the owner shall pay the admeasurer's:

(a) Pay based on the hourly rate for the grade or level of position held or the daily military compensation rate, as appropriate;

(b) Travel expense based on the estimated cost of travel from and return to the nearest port of entry, customs station, or office of an officer-in-charge, marine inspection; and

(c) Daily subsistence expense from the time he leaves his official duty station until he returns thereto.