Speed Calibration (Advanced, With Temp/Speed Only); Local Time Zone (Advanced); Daylight Saving Time (Advanced); Position Format (Advanced) - Humminbird 398ci SI Combo Operation Manual

Speed Calibration will adjust the speed readout by the percentage entered,
and will appear in the menu if a Temp/Speed Accessory is connected and the
paddlewheel has moved at least once.
Local Time Zone selects your time zone in reference to the time reported by the
GPS receiver when Time+Date is selected as a Digital Readout on the Sonar
View (see Setup Menu Tab: Select Readouts).
Daylight Saving Time adjusts the time display to account for local Daylight
Saving Time when Time+Date is selected as a Digital Readout on the Sonar
View (see Setup Menu Tab: Select Readouts).
Selecting On adds one hour to the time display adjusted for your local time
zone. Selecting Off leaves the time display as adjusted for your local time zone.
Position Format selects the format of the latitude and longitude position display.
Speed Calibration
(Advanced, with Temp/Speed only)
Settings: -20% to +20%, Default = 0%
Local Time Zone
(Advanced)
Settings: Various, Default = EST [UTC-5] - Eastern
Standard Time
Daylight Saving Time
(Advanced)
Settings: Off, On; Default = Off
Position Format
(Advanced)
Settings: dd.ddddd°, dd°mm.mmm', or dd°mm'ss";
Default = dd°mm.mmm'
161 Setup Menu Tab