Waypoints switch too soon

[jschall]

When flying a multi-leg plan, puttering along at between 80 and 100 knots in the default Piper Cub, I notice that the Plan-G HSI switches to the next leg long before I am anywhere near the next waypoint. Is this the intended behaviour? Does it depend on the True Airspeed setting in Plan-G (100 knots by default)?

- Jeff Schallenberg
Mont Saint-Hilaire, Québec

[tim arnot]

If you could upload the flight plan, and tell me which legs switched too soon, I'll take a look. It's an area that's being reviewed for beta 2...

[jschall]

OK, here is the flight plan, Tim - but AFAIK, any flight plan will show the early-switch behaviour on any leg, at least on my installation. I will double-check, though.

Thanks for looking into this. In my opinion, the Plan-G HSI should behave just like the default GPS - i.e., it shouldn't switch legs until you are right over the waypoint.

- Jeff

Update: I tried with a different flight plan. The Plan-G HSI switched about 2/3 into the leg (at 60-80 knots), about 5 nm from the 1st waypoint.

I hope this can be corrected!

PS: Does anybody else get this premature waypoint-switch behaviour? - JS

[normandean]

I can confirm this. I tried a flight with an Auster Autocrat and the HSI changed some 5 or 6 miles before the waypoint.

Norman

[jschall]

I finally got around to looking more closely at this behaviour, using Plan-G's Rang Rings! The switch to the next waypoint occurs at exacty 2.0 nm before the current waypoint.

At least, on my installation.

- Jeff

[Harley Glossop]

in plan-g click on the globe and goto options, in the options window that pops up goto the gps panel tab, and in there change target position to like 1nm before waypoint or smaller if you want. I think thats the setting that determines when it changes to the next leave as it thinks youve reached the waypoint. if you want to be really precise you could make it like 0.25 or something so you have to fly basically over the waypoint.

[tim arnot]

No, that won't make a difference. The setting you are talking about only affects the VNAV profile.