APCC Feature Request: Sync time from GPS?


W Hilmo
 

Hello,

I just got back from a trip to a dark sky site, and I have a feature request:

Would it be possible to add a button to the GPS tab in APCC to sync the computer to the GSP time?  My scenario is that I am setting up at a remote site, without any cell or internet connectivity.  I always set up during the day and do a daytime polar alignment.  The daytime polar alignment wants very accurate location and time information.  The location information is easy.  I have a USB GPS receiver and APCC can read it and create a new site based on the current location.  To get an accurate time, though, I'm pretty much manually correcting the time in the computer based on my watch (which syncs nightly to an atomic time source).  Since the computer is dedicated to use with the imaging setup, it's often been powered off long enough for its real time clock to drift.  At home, it's no big deal because it syncs with an internet time source almost immediately after booting.  In the field, though, it would make things easier to be able to automatically update the time from the GPS.

Thanks,
-Wade


Dale Ghent
 

You can use a utility called GPSTime to update the system clock after booting but before starting APCC.

Because your USB GPS device is accessed via COM port, and COM port access is exclusive to 1 application at a time, you cannot have GPSTime and APCC using the GPS at the same time, but this will get you an accurate sync.

If you don't need to have APCC connected to the GPS device all the time, you can continue to run GPSTime in the background and it'll continuously keep the computer's clock in sync with the NMEA time sentences coming off the GPS.

Excuse the garish web design:
https://www.coaa.co.uk/gpstime.htm

/dale

On Jun 25, 2020, at 8:24 PM, W Hilmo <y.groups@hilmo.net> wrote:

Hello,

I just got back from a trip to a dark sky site, and I have a feature request:

Would it be possible to add a button to the GPS tab in APCC to sync the computer to the GSP time? My scenario is that I am setting up at a remote site, without any cell or internet connectivity. I always set up during the day and do a daytime polar alignment. The daytime polar alignment wants very accurate location and time information. The location information is easy. I have a USB GPS receiver and APCC can read it and create a new site based on the current location. To get an accurate time, though, I'm pretty much manually correcting the time in the computer based on my watch (which syncs nightly to an atomic time source). Since the computer is dedicated to use with the imaging setup, it's often been powered off long enough for its real time clock to drift. At home, it's no big deal because it syncs with an internet time source almost immediately after booting. In the field, though, it would make things easier to be able to automatically update the time from the GPS.

Thanks,
-Wade


W Hilmo
 

Thanks for the suggestion. I have that one downloaded and will try it the
next time out.

It would still be nice if APCC could do this, though, since it already has
access to the GPS data.

-----Original Message-----
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Dale Ghent
Sent: Thursday, June 25, 2020 7:17 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APCC Feature Request: Sync time from GPS?


You can use a utility called GPSTime to update the system clock after
booting but before starting APCC.

Because your USB GPS device is accessed via COM port, and COM port access is
exclusive to 1 application at a time, you cannot have GPSTime and APCC using
the GPS at the same time, but this will get you an accurate sync.

If you don't need to have APCC connected to the GPS device all the time, you
can continue to run GPSTime in the background and it'll continuously keep
the computer's clock in sync with the NMEA time sentences coming off the
GPS.

Excuse the garish web design:
https://www.coaa.co.uk/gpstime.htm

/dale

On Jun 25, 2020, at 8:24 PM, W Hilmo <y.groups@hilmo.net> wrote:

Hello,

I just got back from a trip to a dark sky site, and I have a feature
request:

Would it be possible to add a button to the GPS tab in APCC to sync the
computer to the GSP time? My scenario is that I am setting up at a remote
site, without any cell or internet connectivity. I always set up during the
day and do a daytime polar alignment. The daytime polar alignment wants
very accurate location and time information. The location information is
easy. I have a USB GPS receiver and APCC can read it and create a new site
based on the current location. To get an accurate time, though, I'm pretty
much manually correcting the time in the computer based on my watch (which
syncs nightly to an atomic time source). Since the computer is dedicated to
use with the imaging setup, it's often been powered off long enough for its
real time clock to drift. At home, it's no big deal because it syncs with
an internet time source almost immediately after booting. In the field,
though, it would make things easier to be able to automatically update the
time from the GPS.

Thanks,
-Wade


Tom K4XV
 

I too suffer from the same problem.  Good thought Dale but the APPC GPS app also supplies environmental data for APPM.  Time sync would be very nice also.