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Old 30 April 2014, 20:59   #1
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DIY NMEA GPS source for VHF Radios

So i ordered a Raymarine Dragonfly plotter/sounder combo which looks the mutts nuts until i found out there is no NMEA data output to feed my shiny new Icom radio DSC funtions

Whichever muppet at Raymarine decided to omit the NMEA output should slapped with a wet fish.

The prospect of spending another 100+ on a stand-alone GPS receiver just for the radio made me shudder. So i decided to look at other options.

Serial output GPS pucks are becoming less common now in favour of USB ones, but i found a few sellers on ebay selling them.

HOLUX GR-213 USB OR FEMALE PS2 GPS RECEIVER UP TO 20 SATELLITES | eBay

I little reading found they send out RS232 data in NMEA 0183 flavour.

I paid 10 including delivery for one by calling the seller.

The only niggle is they need a 5v DC power supply, so i butchered an old USB mobile phone car charger and mounted the guts in a little waterproof case with a suitable fuse.

They come with a PS2 plug on the cable which you need to cut off.
Inside you will find several wires. You only need the RED,WHITE, & GREEN. Cut off the others.

RED = +vcc (5v dc)
WHITE= Ground
GREEN = NMEA Data out

Connect your 5v supply to Red (+) & White (-)
Connect your VHF DSC input to Green (Data+) & White (Ground)

It works perfectly.
I checked the VHF's displayed coordinates on google maps and it was accurate to about 3 meters of my position.
The little GPS receiver is extremely sensitive and picks up a good signal inside my garage, so it could be mounted inside you RIB's console without issues which is where mine is going at the weekend.

Voilla. DSC functions for a tenna
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Old 01 May 2014, 01:58   #2
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good fix
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Old 01 May 2014, 03:57   #3
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Ha! Good hack

You weren't tempted to buy a taxi radio system from the same eBay seller?

("Dover Coastguard, that's a big ten-four. I have POB and will be there in five. Ta")
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Old 01 May 2014, 04:07   #4
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Get a 2nd wet fish and slap the Icom muppet for not fitting an internal gps.
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Old 01 May 2014, 04:59   #5
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i was looking at the dragon fly but was put off by the lack of output, this would solve my issues so think i will be copying, thanks for sharing
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