What is The Trick For Mapping A Course With Zero Off

scuppersscuppers Posts: 529 Solid Baller
After going through the course very slow and hitting the button on the screen right as the gate buoy crosses the gps puck, mapping in both directions, the beepes don't match the bouys. It seems worse when it's windy. The course was surveyed in by Eddie Roberts. It's supposed to RC. What am I doing wrong?
Chuck Link, Deland Florida


  • MISkierMISkier Posts: 3,336 Mega Baller
    I wonder if one of the pucks is bad and the system is getting confused/inconsistent due to that.
    The worst slalom equipment I own is between my ears.
  • rockdogrockdog Posts: 673 Crazy Baller
    I don't know the ins and outs of ZO but I would think wind should have nothing to do with it.
  • ForrestGumpForrestGump Posts: 6,288
    You don't map in both directions. You map both gates in one direction.
    Shane "Crash" Hill

  • Chuck_DickeyChuck_Dickey Posts: 1,462 Crazy Baller
    edited October 2014
    Make sure a "diff" number is displayed before mapping. Like Shane said, one direction only.

    The "diff plus a number, like "Diff 8" shows the number of land based GPS stations ZO finds. ZO uses space based and land based signals to be accurate to one meter (39.2"). Diff stands for differential. If you start mapping before they are displayed the accuracy suffers. This corrects satellite drift.

    If it beeps about the same distance before in one direction as past the buoy in the opposite direction, that's acceptable. It should only be off by one meter at most.

    All this is based on properly working pucks.
  • mwetskiermwetskier Posts: 1,337 Mega Baller
    @Chuck_Dickey -not to put too fine a point on it but a meter is 39.37 inches -often rounded to 39.4 inches.
  • scuppersscuppers Posts: 529 Solid Baller
    Thanks for all the input. @Shane - yes I figured that as well - I just tried mapping in the opposite direction to see if it corrected things. @Chuck_Dickey that's exactly what it does. Headed north it is beeping before and headed south it beeps after. I guess the speed is the speed but so far I'm not that excited about ZO. Too many years on PP I guess.
    Chuck Link, Deland Florida
  • blockblock Posts: 172 Baller
    It should be very close either way, if it is not you probably have a bad puck. Try unpluging one and map then the other and map. This will help you identify a faulty puck. If you still have problems let me know. [email protected]
    John Seiler
  • DkLkSkrDkLkSkr Posts: 45 Baller
    Is Zero Off as simple as map the course and go? In other words once you map the course you do not have to worry about running baselines or changing background settings like Perfect Pass? Or is there more setup to Zero Off other than mapping the course?
    Gregg Doster
  • scuppersscuppers Posts: 529 Solid Baller
    Someone (anyone) (who) knows more than me chime in here for @DKLKSkr
    Chuck Link, Deland Florida
  • skier2788skier2788 Posts: 810 Crazy Baller
    @DkLkSkr‌ yes ZO is map it and run. No baseline or anything to mess with.
    @scruppers make sure you have all the old courses deleted out. My boat would switch courses going each direction. Cleared all the course out and remapped. Worked great after. We have a portable and drug it down lake a bit. I wanted the oiginal for when we moved it back but it made ZO do weird things with two courses mapped at almost the same spot.
    Travis Torley
  • DkLkSkrDkLkSkr Posts: 45 Baller
    @skier2788 Thanks! Sounds awesome compared to fidgeting with Perfect Pass!!
    Gregg Doster
  • The_MSThe_MS Posts: 6,517 Member of the BallOfSpray Hall Of Fame
    If the times are good, your in.
    Shut up and ski
  • Chuck_DickeyChuck_Dickey Posts: 1,462 Crazy Baller
    @DkLkSkr‌ ZO is great! No crew weight, no skier weight, no wind adjustments, no baselines! It has a practice mode that you can adjust speed in 1/10th mph. The touch screen version in my 2014 ProStar is fantastic!
  • DkLkSkrDkLkSkr Posts: 45 Baller
    @Chuck_Dickey‌ Thanks! That makes me want to upgrade to a new boat even more. And I'm sure on top of this all it gives an even pull with great segment times all the time. Would be awfully nice to not have to look at segment times and just enjoy a great pull. Almost sounds too good to be true compared to what I've been working with!
    Gregg Doster
  • scuppersscuppers Posts: 529 Solid Baller
    @Chuck_Dickey‌ @block‌ @skier2788‌ Thanks guys - I got it working! I deleted all the courses in the ZO memory, Checked the function of both pucks, checked my diff setting (8),Re-mapped in one direction and it beeps right on time! Thanks for the help. I think I had too many failed attempts in the memory bank.
    Chuck Link, Deland Florida
  • adkh2oskieradkh2oskier Posts: 203 Baller
    A little off the subject but I have a question. I am thinking of upgrading my boat to something newer w Zero Off. I installed my own course almost 20 yrs ago and I'm not sure how accurate it is, I put it in through the ice. All I used was a big spool of rope and a Sheetrock T-Square. It skiis quite well and never moves, put 6' pieces of Re-bar directly sunk into the lake bottom. My question is: How does Zero off work if the course is to short or to long? Will the times be off? Will the boat run fast or slow?

  • DragoDrago Posts: 1,688 Mega Baller
    @DkLkSkr‌ ZO is too good to be true. But it's true. Total game changer. 20 year leap ahead of pp.
    If only I could put it in my ' 97 Nautique ...
    If only....(sigh)
    SR SL Judge & Driver (“a driver who is super late on the wheel and is out of sync”)
  • thagerthager Posts: 5,393 Mega Baller
    Saw a nice 02 SN 196 for sale in Minneapolis Craigslist with the 330 Excaliber and about 325 hours. Upgrade it to ZO and be way ahead!
    Stir vigorously then leave!
  • Chuck_DickeyChuck_Dickey Posts: 1,462 Crazy Baller
    @adkh2oskier The course needs to be in tolerance or you'll not get good times. ZO knows where it is suppose to be in the course and will give all buoy timing accordingly. Might be a pain, but a survey of your course may be in order.
  • ForrestGumpForrestGump Posts: 6,288
    I disagree. ZO doesn't care the length of the course. It's times and speeds will ALWAYS be in tolerance across 849 ft 8 7/8 inches. If your course is 840 ft, ZO is still going to come in with accurate speed because it's calculating based on 849 8 7/8 inches, not on 840 ft. It only cares about the two points you plot which correspond to entrance gates.
    Shane "Crash" Hill

  • thompjsthompjs Posts: 541 Solid Baller
    @ShaneH Wow, you are finally right about something! Just kidding but that is the correct explanation of ZO
  • Chuck_DickeyChuck_Dickey Posts: 1,462 Crazy Baller
    edited October 2014

    Question: If the course is short, say 10ft short, are you saying ZO will plot the buoys equally down the length? Or are you saying it will beep where the buoys and exit gates should be based on an accurate course length?
  • thompjsthompjs Posts: 541 Solid Baller
    The latter is correct. So at 34.2 the boat covers 259 meters in 16.95 secs +/- .02 every time.
    RC tolerance for total length is about 2.5 ft either way.

    If you are using PP classic on a short course your times will be right, but the speed is not!

  • SkiJaySkiJay Posts: 2,314 Mega Baller
    So if your course is short, ZO will get the speed and time right; you'll just have balls coming at you a tiny bit faster than ZO's beeps. Not a bad way to practice because this would make visiting an RC course easier to ski.
    www.FinWhispering.com ... Your ski should be your dance partner, not a wrestling opponent
  • RichardDoaneRichardDoane Posts: 4,794 Mega Baller
    @adkh2oskier‌ when you map a course and it's to far out of tolerance, ZO will give you an error message to try again
    BallOfSpray Pacific Northwest Vice President of Event Management, aka "Zappy"
  • adkh2oskieradkh2oskier Posts: 203 Baller
    @SkiJay: maybe that is why I tend to get better scores in tournaments than in practice? Also could be that my water is very clean and clear and feels fast compared to small private ski ponds which tend to have much more sediment?
  • Ed_JohnsonEd_Johnson Posts: 2,297
    edited October 2014
    @adkh2oskier.....In answer to your original question. No the boat will not run fast or slow, it will run right on speed and the times will be accurate...When you Map the course with the on screen display and hit the enter button at the entrance gates, that is simply a GPS starting point...When you hit the button again at the exit buoys, that is the starting point for the other direction...ZO could care less if you have a long or short course...It is strictly going to trigger at the 'Starting Point" you entered and run for a specific distance, time and speed...You could take the buoys out, ZO could care less if you even have buoys there, as long as you had the entrance gates to mark the starting point....However, if your course is accurate the "Beeps" should match the Buoys.
    Special Thanks to Performance Ski and Surf and the Denali Adam's !!!
  • LeonLLeonL Posts: 2,649 Crazy Baller
    ZO is going to run 34.2(or whatever you set) regardless of whether you map or not. It really doesn't care if you map a course to run accurate speed, it just won't display times.
    Leon Leonard Stillwater Lake KY - SR Driver SR Judge
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