Operation Manual

A Navigation receiver warning A = OK, V = warning
4916.45,N Latitude 49 deg. 16.45 min North
12311.12,W Longitude 123 deg. 11.12 min West
000.5 Speed over ground, knots
054.7 Course made good, true
191194 Date of fix – 19 November 1994
020.3,E Magnetic variation: 20.3 degrees East
*68 Checksum is mandatory for RMC
VTG
$GPVTG – Vector track and speed over ground
Example: $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K
Sample Data Description
054.7,T Track, degrees relative to true north
034.4,M Track, degrees relative to magnetic north
005.5,N Ground speed, knots
010.2,K Ground speed, kilometers per hour
SMS
SMS (Short Message Service, or text messaging) requires a cellular modem with an active data plan. SMS is not
designed to be a full remote management feature: SMS allows you to connect to the router for a few simple queries or
commands with a text messaging service (e.g., from your phone). A modem that does not have an active data
connection may still be reachable by SMS because Internet traffic and SMS traffic operate on separate channels, so
SMS can be used to bring an offline router back online.
SMS is enabled on the router by default. However, it only works if SMS is supported and enabled on the modem. Most
modems have SMS enabled by default, but the carrier may charge a fee for each text message sent or received.
Contact your carrier to review these fees and/or to enable an SMS plan.
Important notes about SMS:
Messages are limited to 160 characters.
SMS is not a guaranteed delivery protocol. The carriers do not guarantee that the SMS message will be delivered to
the modem or that the modem’s response will be delivered to the sender. This means an administrator might have
to send messages multiple times before the desired action is performed.
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