Lowrance electronic iWAY 350C - Manual (Page 50)

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Complete information and instructions for installing an update will be
available on the update's page at the Lowrance web site.
GPS Status
The GPS Status command opens a GPS Status Screen, which provides
information on the satellite signals that your iWAY is monitoring to
determine your position. You can access the GPS Status Screen by
choosing
GPS S
TATUS
from the Options Menu. A screen like the one in
the following image will appear.
The iWAY GPS Status Screen.
The GPS Status Screen contains several graphical elements that repre-
sent a lot of information.
Current Position Lock
Three buttons along the left side of the GPS screen indicate the quality
of the units position lock. The button that's selected indicates your cur-
rent position lock. If none of them is selected, your current position has
not been established.
2D means the iWAY has achieved a lock on your current position on a
map. A 2D lock does not include your altitude. The iWAY must receive
reliable signals from 3 satellites to establish a 2D lock.
3D means the iWAY has achieved a more reliable lock, including not only
your coordinate location but also your altitude (or elevation). The iWAY
must receive reliable signals from 4 satellites to establish a 3D lock.
WAAS means your GPS is receiving reliable correction signals from the
FAA's Wide Area Augmentation System. WAAS is designed for use in
aircraft, but occasionally terrestrial vehicles can attain a WAAS lock.
This is the most accurate position signal available in the iWAY.