On Apr 22, 2:30*pm, wrote:
I thought this would be simple, but I can't find the answers in the
manual.
1. *How many turnpoints can I load into the memory (not the task, but
the turnpoint file)?
2. What NMEA sentences are output to the serial port?
3. Not that I will do it, but can I change the data output to NMEA
sentences other than the default?
Questionable minds want to know.....

According to the articles page on the Cambridge website, the 300
series holds up to 250 "turnpoints".

The Cambridge articles only mention NMEA-0183 output. No mention of
anything else or of any "options" to change it.