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Posted by Cathy on December 25, 2007, 9:15 am


I have recently purchased a boat that came with a Garmin GPS 152 fitted.
This is connected to the VHF Radio via NMEA and provides both myself and the
people I would call in an emergency with GPS Position.

Problem is when I start the engine (which will be very likely in an
emergency), there seems to be so much draw on the battery that the GPS unit
turns itself off.

I therefore have to remember to turn the GPS on again every time I start the
engine. (otherwise I also stop recording my track and distance etc.)

My question is really. Is there not a way in which I could set the unit up
so that it turns on as soon as the power is turned on. Just like the VHF
Radio turns on when I turn the power on?

TIA
C



Posted by RW on December 25, 2007, 1:33 pm



>I have recently purchased a boat that came with a Garmin GPS 152 fitted.
>This is connected to the VHF Radio via NMEA and provides both myself and
>the people I would call in an emergency with GPS Position.
> Problem is when I start the engine (which will be very likely in an
> emergency), there seems to be so much draw on the battery that the GPS
> unit turns itself off.
> I therefore have to remember to turn the GPS on again every time I start
> the engine. (otherwise I also stop recording my track and distance etc.)
> My question is really. Is there not a way in which I could set the unit up
> so that it turns on as soon as the power is turned on. Just like the VHF
> Radio turns on when I turn the power on?

Perhaps connect the feed of the Garmin to the same feed the VHF is connected
to



Posted by Cathy on December 25, 2007, 7:01 pm


They are connected to the same feed. The Garmin requires me to push a button
to turn it on again. I was hoping that there might be some way to override
this so it turns on as soon as it received power.


>>I have recently purchased a boat that came with a Garmin GPS 152 fitted.
>>This is connected to the VHF Radio via NMEA and provides both myself and
>>the people I would call in an emergency with GPS Position.
>> Problem is when I start the engine (which will be very likely in an
>> emergency), there seems to be so much draw on the battery that the GPS
>> unit turns itself off.
>> I therefore have to remember to turn the GPS on again every time I start
>> the engine. (otherwise I also stop recording my track and distance etc.)
>> My question is really. Is there not a way in which I could set the unit
>> up so that it turns on as soon as the power is turned on. Just like the
>> VHF Radio turns on when I turn the power on?
> Perhaps connect the feed of the Garmin to the same feed the VHF is
> connected to
>



Posted by Peter on December 26, 2007, 7:57 am


Cathy wrote:
> I have recently purchased a boat that came with a Garmin GPS 152 fitted.
> This is connected to the VHF Radio via NMEA and provides both myself and the
> people I would call in an emergency with GPS Position.
>
> Problem is when I start the engine (which will be very likely in an
> emergency), there seems to be so much draw on the battery that the GPS unit
> turns itself off.
>
> I therefore have to remember to turn the GPS on again every time I start the
> engine. (otherwise I also stop recording my track and distance etc.)
>
> My question is really. Is there not a way in which I could set the unit up
> so that it turns on as soon as the power is turned on. Just like the VHF
> Radio turns on when I turn the power on?
>
> TIA
> C
I'm not explicitly familiar with your unit, but if it has an internal
battery it should have a setting so that it either turns off, or keeps
going on loss of external power. If it doesn't then your easy solution
might be to feed it from a small extra battery isolated from the main
supply by a diode so it normally charges in parallel with the main batt
but doesn't get affected by starting volt drop.

Posted by Steve Firth on December 26, 2007, 9:19 am



> Problem is when I start the engine (which will be very likely in an
> emergency), there seems to be so much draw on the battery that the GPS unit
> turns itself off.

Connect the Garmin and the VHF to the other battery, not to the cranking
battery.

If you don't have two batteries, then stop and wonder for a moment if
you really ought to think about fitting another.

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