SPEED 3100 log Installation and Operation Manual
NAVMAN
10
7 Systems of several instruments
Several NAVMAN instruments can be connected
together to share data. There are two ways of
connecting instruments together, NavBus or NMEA.
7-1 NavBus
NavBus is a NAVMAN proprietary system that allows
systems of multiple instruments to be built using a
single set of transducers. When instruments are
connected by NavBus:
If you change the units, alarms or calibration in
one instrument, then the values will
automatically change in all other instruments
of the same type.
Each instrument can be assigned to a group of
instruments (see section 9-2, step 3). If you
change the backlight in an instrument in group
1, 2, 3 or 4 then the backlight will automatically
change in the other instruments in the same
group. If you change the backlight in an
instrument in group 0 then no other
instruments are affected.
If an alarm sounds, mute it by pressing
on
any instrument which can display that alarm.
NavBus and the SPEED 3100
If the SPEED 3100 does not have a speed/
temperature transducer fitted then the unit will
automatically take speed and temperature
readings from another instrument, via NavBus, if
the data is available. For more information, refer
to the NavBus Installation and Operation Manual.
If the boat has a GPS instrument connected to
the instruments via NavBus then you can set up
the SPEED 3100 to use this for speed readings
instead of a speed transducer (see section 9-1
for wiring and section 9-2, step 2 for setup).
Note: The speed from a paddlewheel sensor
is the speed that the boat is moving through
the water. A speed from a GPS is the speed
over the ground. If there is a current then
these two speeds will be different.
If a transducer is not fitted to the unit and the
corresponding external data is not available then
the displayed value will be 0 (for example, when
using a GPS input for speed and no speed/
temperature transducer is fitted to any instrument
on the NavBus then temperature displays as 0).
7-2 NMEA
NMEA is an industry standard, but is not as flexible
as NavBus as it requires dedicated connections
between instruments. Speed, temperature and log
data are output by the SPEED 3100 and can be read
and displayed by the NAVMAN REPEAT 3100 or
other NMEA instrument. The SPEED 3100 can also
receive GPS speed data (NMEA RMC) from any
compatible NMEA GPS instrument - GPS speed
must be selected (see section 9-2, step 2).
