Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
jighed

lowrance h2o gps

10 posts in this topic

i was wondering if anybody else has this problem. last year ice fishing i was on maple lake in annandale and i have the minnesota chip in my unit. i looked on the unit and it said i was fishing in 15 ft of water but when i drilled the hole and checked with my vexilar it was 32 ft. has anybody ran into this problem. it happened this summer to when i was in the boat on cass lake it wasnt the same depth. is there a way to calibrate this unit or are they always like this?

Share this post


Link to post
Share on other sites

Look on the satellites page you will see EPE --ft (Estimated Position Error). This will tell you how far off + or - you could be. I've had readings of upwards of 40+ ft (that I can recall). 40ft off on your position could be the difference between 15 ft of water and 32 ft. of water. Generally the EPE readings that I see are anywhere from 5 to 15 ft. There is nothing you can do to bout a small amount of error. Its built into the signals that the satellites put out however a consistant large error on several different lakes would make me believe that there may be a problem with the GPS.

Also Maple lake is an enhanced DNR map which isn't the most accurate map to start with.

Share this post


Link to post
Share on other sites

A lot of the Maps are just standard DNR maps they can be way off, the High Def Maps which are lakes that have been surveyed are much more accurate but are still not perfect and can have mistakes also.

Share this post


Link to post
Share on other sites

Don't forget to reset your clock too. If it is still on daylight savings time it should be corrected. The GPS needs the correct time and zone to properly calculate positions.

Share this post


Link to post
Share on other sites

I must have missed something in GPS 101. Now I am much more familiar with Garmin's but I don't believe that you set the time on a GPS,(unless the H20 is way different) the sats tell you what time it is. You may have to tell the GPS what time zone you are in, but still does not have anything to do with GPS accuracy. I agree with PierBridge and it is probably the innacuracy of the mapping and not the GPS itself.

Share this post


Link to post
Share on other sites

Sorry for the misunderstanding, I'm not sure if the H2O operates the same as some others but generally its true on many GPS units that you need to manually adjust them for daylight savings time changes. The time transmitted by the satellites atomic clock are UTC (Universal Time Coordinated) and provides no correction for daylight savings. When daylight savings time changes (or when you move to a new time zone), you need to go into Setup - Time Format and re-select the time format you are using unless you are using UTC. After selecting the format, you will be given the opportunity to change the time.

As far as the accuracy being off, typically, errors of 30 meters or more are not unusual. Now that Selective Availability has been removed, typical GPS position accuracy is approximately 15 meters (50 feet). It doesn't really matter how accurate the map is if you have that much GPS variance. Its also possible that the maps were made using GPS and were made before the removal of Selective Availability which could in the past degrade the GPS accuracy up to 100 meters.

Share this post


Link to post
Share on other sites

I looked and my H2Oc adjusted to daylight savings on its own.

Share this post


Link to post
Share on other sites

Most equipment for the US Market is programmed for DST on its own, like vcrs and computers. Of course now that it starts a week early and ends a week late that won't be right.

And if I were surveying a lake I would use the surveyor style differential GPS where a base station at a known location transmits corrections to the portable unit. That provides accuracy better than a few feet I think.

I know a guy indirectly that was using one taking sediment cores in lakes and supposedly he could drop the coring tool down the same hole the next day.

If the WAAS is working on the Lowrance, I think the error is in the tens of feet.

Share this post


Link to post
Share on other sites

Quote:

Most equipment for the US Market is programmed for DST on its own, like vcrs and computers. Of course now that it starts a week early and ends a week late that won't be right.


Starting in 2007, DST begins 3 weeks earlier and ends 1 week later, but you can teach your iFinder about that:

In Advanced Mode and after you've aquired a position, Hit Menu twice > System Setup > Set Local Time... > Config DST > Change 'Country (United States)' to 'User Config' > Start Date: second Sunday in March, End Date: first Sunday in November.

My software version is 1.1.0 and still had the old dates. I would imagine the next version will update the default U.S. setting.

Share this post


Link to post
Share on other sites

thanks for the info

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • ZachD
      So I am torn I want to put a graph in my smaller boat.. I love my lx 6 flasher and am thinking about getting the high speed transducer for it and just going with that but I don't get why they charge $199 for it when bird and lowrance ducers are far less   I almost pulled the trigger on the lowrance hook 4 with down scan and chart plotter at gander for $179  I don't care about the chart plotter really as I have a big hand held gps that I use in that boat and that screen is larger than the hook 4 when you have it split plotter and graph they only had the display model left and wouldn't go lower price so I passed   If I can find the hook 4 at another gander that doesn't have the chart plotter for cheaper I may go with that   Does any one have experience with the lx on open water I hear it is at par with an lowrance elite 5 I am kind of wanting to go with that but don't know   What would you do run the lx open water or go with hook 4 with down scan  
    • bmc
      We survived our trip!  LOL   Fishing was steady.   We caught 30 walleyes in 3 days of fishing.  Usually fished from 11 am to 4 pm.  The 'eyes were running small, lots of 11 to 13 3/4" fish, but we did get 3 keepers.  We also kept a few nice perch and crappies.  We also caught a few snake northerns.   Jigging w/ chubs produced the best, but I did catch a few 'eyes on the crawler lindy rig combo.  Mid lake structure and underwater points off of islands all produced fish.  Mayflys were hatching, but the fish were still hungry. I did catch a 4-5 lb channel cat in the Savanna River one evening.   We stayed in the south loop of the Army Corp campground.  We liked that we were w/in about 30 yds of our boat which we kept at the dock.  The river on the north side of us and the lake on the south side offered a nice breeze to keep things cool and the bugs away for the most part.  Con's were the campsites are small and were too close together.  Also no turn around at the end of the south loop road.  The north loop was beautiful, spacious campsites, but surrounded by swamp and we heard the skeeters were bad at dusk.  Definitely want some thermacells or a screen tent to enjoy the evening by the sounds of things.  Also the docks aren't close/in view of the campsites.   We would definitely stay there again, on the north loop, in May or Sept. after the skeeters have died down a bit.   Staff was friendly, shower houses were nice, boat landings were nice.     Brian
    • MedicineMan
      Went out Thursday for a few hours. Caught a 28" Walleye along with a handful of nice sized Bass.
    • knoppers
      thanks for the report.
    • JBMasterAngler
    • JBMasterAngler
      Just got back from our 34th annual Grand Marais trip. Weather, and how bad it was, was the theme. At one point or another, it rained every single day we were there! The wind was miserable he last couple days as well. Really affected our fishing plans, as we had to cancel out on some of our normal lakes, and fish some less than desirable backup lakes.   As per tradition, we left in the middle of the night and pulled up to the Lester River just a few minutes before sunrise. Didn't catch anything there. Also got skunked at the Talmadge and French rivers. I got free admission at Tom's logging camp on account it was Father's Day  and as always, kids had fun feeding the animals. I did catch a few little rainbows out of sucker, knife, and Stewart rivers. Had our traditional "fisherman's breakfast" at McDonalds in Two Harbors. We stopped at the silver creek tunnel, and that was the first time I've been at the overlook since it was actually part of the highway back in '94. We rolled into Grand Marais at about 3:30 and had to wait out a rain storm before putting the boat out on Kimball Lake. We lost several trout, and in the end, only my 6 year old son caught 2 rainbows.   Monday we fished Greenwood Lake, and as was the case with my 2 older kids, my 3 year old daughter caught her very first fish here...a smallmouth bass! Between all of us, we caught about 130 bass, all of which were pretty small. Unfortunately no lake trout. However, a big surprise occurred...while casting for bass, I caught a herring! Then a few minutes later, my son caught one also! Never would have guessed I'd ever catch one in the summer, let alone 2!   Fished a "secret lake" on Tuesday and caught quite a few northerns. They were all either 5 pounds, or 6 inches long, nothing in between. My son caught an 8 pound, 33 incher, which ended up being the biggest fish of the trip. We was screaming, and excited, and wanted me to take his fishing pole. But after about 10 minutes he finally got it in so I could net it. He's still bragging about it. My 3 year old also caught her 2nd ever fish, a perch, which ended up being the only one of the trip.   Went up to Saganaga on Wednesday. I spent I don't know how many hours trying to catch lake trout, but didn't find any!  Finally gave up and ventured deep into red rock bay for the first time ever. Really nice back there, wish I would've went there first. Fishing was ok, considering the weather was starting to get bad. Caught the biggest bass of the trip, a hair over 18 inches. On the drive back we seen a bear. Ironically it was walking down the road to black bear lodge at Poplar Lake.   Biggest disappointment came on Thursday. The plan was to fish both Hungry Jack and West Bearskin lakes. The wind was terrible, and coming straight from the west. Had hungry jack not had the reputation as a big bass producer, I wouldn't have went here. Unfortunately the big bass weren't around, nor any bass for that matter. Only caught 4 small bass. Kids caught about a dozen or so sunnies from the dock at the resort, some of which were decent size. We didn't even bother with bearskin. There's no way we would be able to launch our boats in that wind. We went to Loon Lake instead. In the limited time we were there, we caught about 30 tiny bass. My 9 year old daughter also caught her first rock bass. I tried for lakers, and marked a lot of them, but didn't catch any.    So since we didn't fish West Bearskin as planned, we penciled it in for Friday. Knowing the weather was going to be bad, we picked Poplar Lake as our backup. I drove up to Mayhew Lake to start, because I wanted to check out the launch. I was able to get my boat down the launch, but it was a real tight fit. Nice little lake. We saw a mommy moose with 2 babies laying right on the shoreline. I got sick of trolling, so I decided to cast cranks along the drop offs of the one small stretch of shoreline that was out of the wind (relatively speaking). Hooked into a big fish! Got excited because I thought I finally had a lake trout! It was a northern!  never thought I'd be disappointed in catching a 5.5 pound pike, but that's what I was. Didn't bother going to Bearskin, as I knew the wind was too bad again. Went to Poplar, which is a lake I do not like! As is typical, the fishing was no good! He weather was bi polar! It would be bright and sunny, then rain for 20 minutes. Did that the whole rest of the day! Only caught 1 little pike and  1 little bass. Got excited for a minute, as whitefish started surfacing around my boat in the evening. I was hoping I could catch 1 or 2, but nope!    Saturday we were supposed to fish Two Island for a few hours before going home. But it was pouring rain. We didn't even bother driving around to different boat launches. So the trip ended on a sour note, but we still had lots of fun, seen a moose, had our donuts (I highly recommend the bacon maple longjohn by the way), and went to Sven & Ole's. I was going to go camping in Ely in July, but I think we'll come back to Grand Marais instead, and try to make up for what we missed out on due to the weather. IMG_6122.MOV
    • CaptJohnWis
      I have not been on Rainy much as of late. On June 12, I got 75 walleyes in about 6-8 FOW. On. June 15 (Sanctuary opener) I hit Stangi for several hours and only got four fish. June 17, got 20 fish in about five hours - mostly walleyes on a weed edge in about 8 feet of water. Many on jig with Lunker CIty trailers. Also some good ones on a feather jig. Bass were few and far between. Plus some pike but nothing huge. Biggest walleyes 24-25". Bass 18", pike 29". View my fishing report to see videos of lures that were working.   I did mark lots of fish in deeper water but they were dink walleyes so I did not fish them for long.The dinks are actually harder to catch on lures than bigger ones. They respond better to live bait which I don't use.
    • Cliff Wagenbach
      We had a good bite on 1/2 crawlers today! Boated 45 walleyes and kept our limits of fish that were all between 15-1/2" and 19-3/4 "! Released at least 6 slot fish. Largest was a fat 25-1/2 inch fish. Best over all sized fish limit all summer! The walleyes were stuffed with either May fly nymphs or molted crayfish.  
    • Michael Felix
    • Michael Felix
      I've fished the hex hatch many times. In wisconsin.The hexs are out at my lakevplace in grand rapids Mn.  its usually a little later on the river. So this weekend into next week and the following week ought to be good. Late in the evening.. like  9:30 on...  I haven't been to the straight for years... I wish you'd let me know how it goes...