Trip data minus the drift

[fishing111]

How do you guys work out your mileage for when the motor is running excluding drifting? I don't have a fuel sensor, however I read somewhere a while ago that there is a setting on some GPS units that allow you to exclude drift from trip data. Does anybody know what that setting is called, or is my memory is stuffed and i have it completely wrong and there isn't a setting ?

[Rip it up]

Re: Trip data minus the drift

I have a lowrance GPS. I can set a minimum speed setting on the travel log screen. So set for 3knts I doubt you will drip faster than that.

[thelump]

Re: Trip data minus the drift

I have a lowrance GPS. I can set a minimum speed setting on the travel log screen. So set for 3knts I doubt you will drip faster than that.

Unless you're really wet!

[Rip it up]

Re: Trip data minus the drift

Well done lumpy good pick up. iPhone predictive text strikes again.

[Crunchy]

Re: Trip data minus the drift

How do you guys work out your mileage for when the motor is running excluding drifting? I don't have a fuel sensor, however I read somewhere a while ago that there is a setting on some GPS units that allow you to exclude drift from trip data. Does anybody know what that setting is called, or is my memory is stuffed and i have it completely wrong and there isn't a setting ?

Good question, been wondering the same thing myself....if you have garmin and find the answer can you post it back up?

Cheers
C

[fishing111]

Re: Trip data minus the drift

Thanks for that RIp it up. Just got a new unit and thought i would try and work my fuel burn out as accurately as i can. Buggered if i can see the setting on the Garmin, but i'll keep looking.

Cheers F1

[fishing111]

Re: Trip data minus the drift

Didn't see your response Crunchy as i had a post half finished in quick reply and thought i would have another quick look through the manual. Will do if i find out.

Cheers F1

[fishing111]

Re: Trip data minus the drift

http://www.youtube.com/watch?feature=player_embedded&v=kb40uXsmc9g

Crunchy if you go 3 minuets and 2 seconds in you will see a reference to the speed filter. I think this might be it, however in the Garmin manual ( page 54 of 100 ) say's " The speed filter averages the speed of your boat over a short period of time for smoother speed values". It doesn't mention anything about drift so not completely sure if this is it ?

[marto78]

Re: Trip data minus the drift

Its not to difficult to work out if you think about it and unless your doing short trips with big drifts its not going to make a lot of difference at the end of the day.

Say you do 40 drifts per day with an average drift being 150m, that equates to 6km of drifting.
If you have done 140km for the day minus the 6km.
And if you spend 10min/drift thats 400min or 6.66hrs of drifting/fishing per day, which is a fair amount if you then factor in 3hrs travel to and from your spot.

3hrs travel
6hrs drifting
3hrs driving back onto your mark
Total 12hrs on the water, which is an average day for most punters fishing outside the bay.

Say you use 80L for the day,
132km divided by a 80L gives you 1.65km/L
Round it down to 1.6km/L or 1.5km/L just so you have that safety margin for error.

There is not much point in being accurate to within 0.5km because your fuel/km ratio is going to change all the time depending on sea and weather conditions, how fast yu drive back onto your mark etc... So long as you can work out an average what your boat is going to use for a days fishing you will be able to work out how much fuel to take on those bigger trips.

[thelump]

Re: Trip data minus the drift

Its not to difficult to work out if you think about it and unless your doing short trips with big drifts its not going to make a lot of difference at the end of the day.

Say you do 40 drifts per day with an average drift being 150m, that equates to 6km of drifting.
If you have done 140km for the day minus the 6km.
And if you spend 10min/drift thats 400min or 6.66hrs of drifting/fishing per day, which is a fair amount if you then factor in 3hrs travel to and from your spot.

3hrs travel
6hrs drifting
3hrs driving back onto your mark
Total 12hrs on the water, which is an average day for most punters fishing outside the bay.

Say you use 80L for the day,
132km divided by a 80L gives you 1.65km/L
Round it down to 1.6km/L or 1.5km/L just so you have that safety margin for error.

There is not much point in being accurate to within 0.5km because your fuel/km ratio is going to change all the time depending on sea and weather conditions, how fast yu drive back onto your mark etc... So long as you can work out an average what your boat is going to use for a days fishing you will be able to work out how much fuel to take on those bigger trips.

Spot on Marto. If you have no fuel flow meter or NMEA hooked up then just fill your fuel tank, set your trip meter on your plotter, and try to refill at the same servo/bowser. This should give you a reasonably accurate usage for the day and after a couple of trips in varying condition you should be able to work it out pretty accuarately. Better still get a fuel flow gauge or NMEA if motor allows.

[netmaker]

Re: Trip data minus the drift

alternatively you could plot your starting and finishing drift points, use the goto function to measure the distance between them and subtract the drift km's from the days total.

[honda900]

Re: Trip data minus the drift

You can download your track into home port, from there you can total all the points in your track to determine the "exact" distance you travelled on your drift. take that and subtract it from the total distance travelled from your track to get an "exact" distance and work it out from there..

easier to do as the others have said though and simply average it out.. just depends on how accurate you want to be.

this is how accurate you can be..



Regards
Honda.

[Crunchy]

Re: Trip data minus the drift

http://www.youtube.com/watch?feature...&v=kb40uXsmc9g



Crunchy if you go 3 minuets and 2 seconds in you will see a reference to the speed filter. I think this might be it, however in the Garmin manual ( page 54 of 100 ) say's " The speed filter averages the speed of your boat over a short period of time for smoother speed values". It doesn't mention anything about drift so not completely sure if this is it ?

Yeh I saw that in the manual but I don't think its the right function....

I tend to do what marto suggests but it would be good to get an accurate measure done by the unit, a few times in 5 knot current I have drifted the length of Stradbroke before even realizing!