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634
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1
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2 Rules for Gas Switching in the Deco Calculation
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3 ===============================================
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4
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5 The deco calculation switches gases on the following rules and conditions.
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6
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7
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8 A new gas to eventually switch to is searched for:
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9 --------------------------------------------------
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10
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11 a) Whenever arriving or staying on a deco stop.
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12
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13 If a new gas is found, it will be taken.
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14
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15 or
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16
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17 b) On each calculation step, given:
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18
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19 1) Cave mode is activated.
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20
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21 If a new gas is found, it will be taken.
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22
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23 or
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24
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25 2) - extended stops are activated, or
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26 - the dive is in bailout mode.
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27
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28 If a new gas is found, it will only be taken if
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29
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30 + the change depth of the new gas has not been passed yet (i.e. the
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31 diver has not passed the change depth of this gas without actually
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32 switching to it, so on purpose is breathing another gas),
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33
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34 and
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35
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36 + the dive is not on the final ascent. (i.e. no gas change will be
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37 considered any more after leaving the last deco stop for surfacing)
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38
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39
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40 When searching for a new gas, in order to qualify a gas must:
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41 -------------------------------------------------------------
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42
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43 a) Be available, i.e. neither be disabled, lost, nor staged,
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44
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45 b) not be of type 'deco gas' unless:
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46
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47 - extended stops are activated, or
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48 - the ascent calculation has arrived on a deco stop, or
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49 - the dive is in bailout mode,
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50
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51 c) have a change depth that is not shallower than the current depth,
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52 (i.e. it must be breathable by configured change depth)
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53
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54 d) have the shallowest change depth among all new gas candidates that
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55 have qualified so far,
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56
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57 e) not yet be fully used up in case contingency mode* is activated.
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58
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59 For a gas to become elected as the new gas, it must match all of the above criteria.
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60
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61 If none of the configured gases qualifies to become a new gas, the deco calculation
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62 will continue on the current (last selected) gas.
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63
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64 ____
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65 * contingency mode is auto-activated in case the dive started in cave mode
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