SUUNTO SPYDER - Manual (Page 54)

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the diver allow the body conditions to stabilize over a period of at least three hours
before beginning to dive at altitude.
WARNING!
SET THE CORRECT PERSONAL ADJUSTMENT MODE! The diver should
use this option to make the calculations more conservative, whenever it is be-
lieved that factors which tend to increase the possibility of DCS exist. Failure to
properly select the Personal Adjustment Mode correctly will result in erroneous
data and can greatly increase the risk of DCS.
ALTITUDE ADJUSTMENT
When programming the Spyder for the correct altitude, the diver needs to select
the correct Altitude Mode according to Table 4.2 As a result the Spyder adjusts its
mathematical model according to the entered altitude mode, giving shorter no-
decompression times at higher altitudes (See Section 8.1, “Operating Principles“,
Table 8.1. and 8.2.)
Table 4.2 Altitude adjustment ranges.