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Old 23 February 2011, 08:11   #1
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Garmin fuel data settings on new GPS

Can someone explain to me the Garmin 'Fuel' data on the 5008 GPS please. I have an N2K fuel level sender which is connected to the network and the Garmin correctly shows that the tank is presently 1/3 full. However, somewhere along the line of setting up the GPS it aksed for my tank size. I input this as 35 gallons, and whilst the GPS fuel gauge still shows 1/3 full the data bar on the nav screen shows that I have 35 gals remaining. I wish.

I know that the Garmin can use fuel usage from the engine to estimate the fuel amount remaining in my tank, but I don't need this with a calibrated N2K sender. It is obviously getting confused in its calculation. I have selected the correct options for using fuel sender not fuel flow for calculations, but it won't play ball.
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Old 23 February 2011, 08:50   #2
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Eliminating the obvious.... Has there been an imperial/metric/US crossover?

Have you added more than two calibration points?
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Old 23 February 2011, 10:08   #3
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Could be like smartcraft which has different calibration methods.

With odd shaped tanks you can calibrate empty, 1/4 full, 1/2 full etc

Maybe the tank needs to have 35 gallons in it when you input the capacity
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Old 23 February 2011, 10:13   #4
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Quote:
Originally Posted by martini View Post
With odd shaped tanks you can calibrate empty, 1/4 full, 1/2 full etc
The Garmin one is quite clever, for odd shaped tanks you can put in several calibrations and can get a very accurate model of your tank.
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Old 23 February 2011, 10:57   #5
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Any idea where in the menus the calibration option is for irregular shaped tanks?
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Old 23 February 2011, 11:04   #6
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Device list, review, level calibration, add cal point.

Start with a known quantity, then add amounts measured not by gals/liters but by percentage of tank capacity. IIRC.

So as you have a 35g tank it might make sense to add 3.5g calibration quantities?
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Old 23 February 2011, 11:15   #7
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I think the manual makes it clearer than my gibbering...

Calibrating the Fluid Level
To use the GFL 10 adapter, you must calibrate the fluid level of the tank that the adapter is associated with, using a minimum of two calibration points. The greater the number of fluid calibration points, the greater the accuracy of the reading on the fluid-level gauge.

1. Turn the boat ignition key to the On position (not Start).
2. From the NMEA 2000 Devices list, select the GFL 10 device.
3. Select: Level Calibration > Add Calibration Point.
4. Select the percentage of fluid currently in the tank, based on the total tank capacity.
5. Select Done.
6. Change the level of the fluid in the tank.
7. Select Add Calibration Point.
8. Select the percentage of fluid currently in the tank, based on the total tank capacity.
9. Select Done.
10. Repeat steps 6 through 9 to add additional, optional fluid-level calibration points.
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Old 23 February 2011, 11:38   #8
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Ahhh, but I don't have a GFL 10, I've got an Offshore Systems NMEA200 sender. Purchased before the GFL 10 was even a twinkle in the Garmin Engineer's eye. Will see if I have a calibrate option for it nonetheless.
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Old 23 February 2011, 11:45   #9
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Quote:
Originally Posted by Erin View Post
Ahhh, but I don't have a GFL 10, I've got an Offshore Systems NMEA200 sender.
Aaaaah

Well, at least you saved thirty squids.

The calibration should be the same surely, as it is the plotter doing all the work? I have not installed the Offshore Sys version though, so I am going out on a limb.
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Old 23 February 2011, 16:39   #10
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Just been out to have a look, and i can't find any calibrate option. It sees the Offshore Sys level nicely, but won't let me do anything with the data it recieves. Think I'll have to contact Garmin Support.
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