M
magnetic variation 90
alarms tab 76
calendar tab 78
celestial tab 79
route tab 70
sonar tab 75
XM tab 69
Man OverBoard.
See
MOB
map datum 127
map orientation 41
marine mode
compass 45
map 38
position data 51
XM Audio 52
marine timer 46
marine warnings 97
maritime mobile service identity.
See
MMSI
marking a waypoint 9, 25, 26, 28
message tab 83
mils 89
Mrn Wx Tab 97
N
NAV/MOB 16
navigate
navigation alarms 76
near
new
altitude 6
NEXRAD Radar 96
next turn 88
alarm 76
no beacon signal 124
O
“Off Route Recalculating” Announce-
off road 87
options menu
P
highway 49
page sequence 13
point 79
position data page 51
position report 72–75, 128–129
power 117
practice mode.
See
simulator mode
proximity
waypoint 33
140
GPSMAP 378/478 Owner’s Manual
I
ndeX