Icon Dissapears near the Internation Date Line

Charts iOS
1

Hello,

Ive been meaning to bring this up, but the aircraft icon disappears near (100nm-50nm) the international date line in the middle of the Pacific Ocean. it reappears after you cross it within 50nm. Its minor bug but a QOL fix would be awesome.

2

Hello! Thank you for the feedback!

We are unaware of this issue. You’re the first to report it! We shall investigate.

First, please provide some more information.

  • You posted this in the Charts > iOS section. Does this issue only occur on iOS?

  • Please confirm that this concerns your own position - not the “online networks” feature and associated traffic.

  • Can you still reproduce this issue with the latest version 8.38.3, released today?

  • What map projection are you using in the settings?

  • I trust that you can reliably reproduce this issue. If that is the case, please provide a waypoint, coordinates, or an airport that we can spawn at to reproduce the problem for ourselves.

Kind Regards,
Malte

3

thanks for the response.

  • Yes, IpadOS 18.3.1, have not tested or used any other version
  • This concerns my only and own aircraft positions (I do not utilize the online network features)
  • I will test this out later today on my PHX-HKG routing for todays charts update. (this has happened with all previous navigraph chart versions with respective IpadOS versions too)
  • map projection Mecator, 100%, no tilt, CAO, GCR, Anchor point: tip, Auto start on.
  • reproduction:
    • NRT-DEN Between Wpts 42N170E 44N180E 47N170W
    • SFO-NRT between Wpts 49N170W 48N180E
    • NRT-SFO between Wpts 34N170E 35N180E 36N170W

Another finding:

  • If you zoom out on the main chart map from a certain point to all the way out your aircrfat icon also dissapears (This is wih version 8.38.3 (Build: c986B832))

New Findings (23:48Z):
SO when i zoom anywhere from 50% out to 100% zoom out and put the screen at the backend of the icon N5816.7 W14826.8 initially it disappears.

however, after more testing, It disappears if the map view being right on the international date line, not the icon, make the icon disappears.

so to make it a little clearer if you put the center of the map on the intl date line the aircraft icon disappears then if you move it to the side the aircraft is on the icon reappears. it could also be that if you move the map view (whatever its called) to the other side of the international dateline the aircraft icon disappears. this has happened with me coding on open maps for an old VA due to longitude wrapping (just had an epiphany and remembered). had to make sure the icons weren’t clipped (their own overlays). if that doesn’t work then maybe something like normalizing the longitudes? wouldn’t have a clue on Xcode

@skysail

4

Thanks a lot for the additional information! We shall look further into this as soon as we have available resources. I can reproduce the issue at least!

As a workaround, feel free to enable the experimental globe projection in the settings! I have not been able to reproduce the issue with that projection yet, so I assume it’s slightly better in this regard.

It’s worth noting that the Globe projection transitions to mercator when you zoom in, so the issue might still show up in some cases depending on your zoom level. We’ll definitely try to iron this out!

Kind Regards,
Malte

1 Like
5

okay, like i said i would research into longitude wrapping. could be a simple fix to have it go through as one. thats my best guess. wish you the best! thank you

6

Thank you for your input! We are maintaining two different map implementations, one of which is based on Leaflet where this kind of issue is a lot more common. We are used to handling wrapping for both map implementations, but so far it has not been necessary for anything but lines that cross the dateline.

Wrapping the value for a point shouldn’t be necessary in this map implementation, and this is likely a bug further down which we need to track down. The technical implementation for the “ownship icon” differs between the web and native platforms for several reasons, which could also be a contributing factor. We’ll dig into it!

1 Like
7

Sweet looking forward to hearing back at a later date if you guys have figured this bug out

1 Like
8

Definitely, I’ll make sure to let you know! Thanks for the report!

1 Like