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CP500 Page 69
12.6 NMEA DATA PAGE
The NMEA Data Page is very useful to see if a External device (example: Depth Sounder)
is transmitting NMEA sentences to the GPS Chart Plotter. This page can also be used to
see if the GPS Chart Plotter NMEA output is being loaded down by a external NMEA device
the GPS Chart Plotter is connected to.
Scenario: VHF Radio connected but the Radio is not receiving a GPS Position.
Usually the VHF Radio will be connected to the Green and Brown wires. To check to see
if the GPS Chart Plotter is transmitting the sentences:
1. Press [MENU]. Move the ShuttlePoint knob to highlight
NMEA DISPLAY and press
[ENT].
2. Move the ShuttlePoint knob to highlight
DATA and press [ENT].
3. Connect the BLUE Wire on the GPS Chart Plotter to the junction of the Brown wire and
the VHF wire. The display should look similar to the picture below.
Figure 12.6 - NMEA Data page
12.7 NMEA DEPTH, WIND SPEED, TEMP AND SOG TREND PAGES
When the GPS Chart Plotter is connected to the Optional FF520 50/200kHz BLACK BOX
FISH FINDER or a Digital Depth Sounder, Wind Speed/Direction, Speed Log with Temp with
NMEA output the GPS Chart Plotter is capable of show Trends in the data from the device.
To select a NMEA Trend Page:
1a. Press [MENU]. Move the ShuttlePoint knob to highlight
NMEA DISPLAY and press
[ENT]. Move the ShuttlePoint knob to highlight
DEPTH TREND/WIND SPEED TREND/
TEMP TREND/SOG TREND and press [ENT].
12.8 VHF DIGITAL SELECTIVE CALLING
Digital Selective Calling is a semi-automated method of establishing a VHF radio call. DSC
had also been designated as part of the Global Maritime Distress and Safety System
(GMDSS). It is planned that DSC will eventually replace aural watches on distress
frequencies and will be used to announce routine and urgent maritime safety information
broadcasts.
This new system allow mariners to instantly send a distress call with GPS position (when
connected to the transceiver) to the US Coast Guard and other vessels within range of the
transmission. DSC will also allow mariners to initiate POSITION Request, POSITION Send
calls to or from another vessel equipped with a DSC transceiver.