The MRT is a table of 50 lines, and each line contains six words with similar sounds (help, yelp, kelp, etc.). Each diver receives this table. A reading sequence is established in which diver A selects and reads only one of the six words on each line (such as "kelp"), marking it off on his table, and working from the first line he proceeds downward with a five second pause between each word. The diver listening has the same table, and using a marker ticks off each of the words pronounced (or at least the one that he thinks is correct).
At the end of the exercise, the transmission and reception word tables are compared. The more words were understood correctly, the higher the level of communications intelligibility.
This exercise was created to verify the quality of communications betweentwo units, and can also be applied in training among groups of divers who use underwater communications often (such as instructors at the same dive school).
This exercise should also be repeated between the underwater (SUB T) and surface (SURF) units, between SUB T and SUB R, and between SURF and SUB R. Intelligibility is considered:
Excellent: if the listeners (both) understand more than 45 words.
Acceptable: if the listeners (both) understand more than 38 words.
Unacceptable: if the listeners (both) understand fewer than 38 words.
The test
is considered invalid if the results between the two divers differ by more than 20%. |
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MRT Table - ENGLISH
MRT Table - DUTCH
MRT Table - GERMAN
MRT Table - SPANISH
MRT Table - ITALIAN
MRT Table - FRENCH
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