In article , Dean Sensui
wrote:

Hi Harlan...

As Bruce mentioned, you need to know the precise lat/lon for at least
three locations in the map. In my case, I had similar USGS maps that
were already calibrated. So it was just a matter of finding the same
locations in each map, then using the USGS map to determine what the
lat/lon positions were and giving GPSPro that same information for
each position.

Dean, it would seem to me that I could use the Chart on my Garmin 182C
to figure out the lat/long of any mark on the digital chart.

The free marine charts won't have support available, unfortunately.
Check out the website and see if the charts you need are available.

Dean, sorry to be dense. For this summer, I am looking for digital
charts covering Nantucket and the South of the Cape to Long Island
Sound. Which website do I go to that has affordable charts for me to
download to my Mac in a form I can load into GSPy Pro?

I
don't know if I can assist with calibration. I might be able to make
some suggestions to assist, however.

By the way, just one posting and I got a half dozen spam with this
email address. Fortunately this particular email address is
"disposable". Those anti-spam safeguards are definitely worthwhile.

So far, the simple no spam I add in has protected me from Spam (knock
on my head). I hope it lasts.

Harlan

BTW, thanks to all who responded.


Dean.

Bruce in Alaska wrote in message
...
In article ,
Harlan Lachman wrote:

Dean thanks for trying to be helpful. Could you explain in a little
more detail what you mean. Sorry I am so ill informed.

What does it mean to need to calibrate a chart (why, how, what skills)?
Why would I want these charts if they are not useful to GPSPRo? Where
does onge get a calibrated USGS map that can work with GPSPro?

Will the provider of those charts have a person available by phone to
help guide one in using their charts for the first time?

TIA,

Harlan


--
Tro respond, obviously drop the nospam!