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New Fishfinder/gps Combo!


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7 replies to this topic

#1 OFFLINE   wildfish

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Posted 03 June 2007 - 09:58 PM

ive just bought a new sounder / gps!
when i took it out for 1st run i found the gps marks i had were all about 200 meters from where i expected to be!
do i need to calibrate my gps?
could my mount possie be effecting my readings?
funny thing my 1st spot i found was looking for the car park, i expected to be in close to the rocks but was about 200m east and my last spot was looking for watts reef and was being lead to hot water outlet so probably about 200m west of my expectations?
any thoughts!

#2 OFFLINE   Flightmanager

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Posted 03 June 2007 - 10:16 PM

Make sure it is set to Eastern Standard time , not Eastern Daylight Saving time. I think this problem was raised a few months ago.

Ross

#3 OFFLINE   wildfish

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Posted 03 June 2007 - 10:19 PM

yes i think i remember this ill go check now thanks ross!

#4 OFFLINE   wildfish

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Posted 03 June 2007 - 10:38 PM

as far as i can tell dst is set automatically on my unit! and dates are correct with us not being in dst at this point!

#5 OFFLINE   pelican

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Posted 03 June 2007 - 11:54 PM

ive just bought a new sounder / gps!
when i took it out for 1st run i found the gps marks i had were all about 200 meters from where i expected to be!
do i need to calibrate my gps?
could my mount possie be effecting my readings?
funny thing my 1st spot i found was looking for the car park, i expected to be in close to the rocks but was about 200m east and my last spot was looking for watts reef and was being lead to hot water outlet so probably about 200m west of my expectations?
any thoughts!



These might be too obvious but check that when you imput your BPS points the new GPS was on the same Datum setting as your old GPS.
eg Datum WGS84. If it wasn't the GPS runs a correction based on the datum and can put you 200m or more out. There are many datums
Check that your input setting / format was the same on the new GPS to the one you got them off in regards to minutes an seconds an 3 decimal place minute and decimal minutes.ie 30 seconds equald 0.5 decimal minutes eg

38 26.755' S 145 10.353' E which is Degrees Minutes & Decimal minutes to 3 decimal places.
38 26' 45.30" S 145 10' 21.18" E which is Degrees Minutes Seconds which would be (for the example converted like for input with Google earth)

How to convert them. Well all I do is change setting in GPS so I input them in the format they came in and then change my settings back to WGS84 and the GPS does it automatically but no doubt there will be a smarty pants web site somewhere.

Edited by pelican, 03 June 2007 - 11:55 PM.


#6 OFFLINE   wildfish

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Posted 04 June 2007 - 04:22 PM

yes its set on wgs84. suppose ill just try again next weekend!

#7 OFFLINE   Chris 55

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Posted 04 June 2007 - 08:26 PM

What make and model is it ?

#8 OFFLINE   wildfish

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Posted 04 June 2007 - 08:46 PM

its lowrance lms527c internal antenna! brand new model!
is it possible my book had wrong marks?
osborn, s34.03.670 e151.11.280
watts, s34.08.080 e151.11.298
also when i get a map card for it will i be able to find the reef on the map and navigate there knowing that the marks may be different, if that makes sense?