On connect, only call readGpsCompassBaseline if on a vn-300

[jfinken]

• Incorporates PR-59 feedback.
• Addresses issue-57.

[dawonn]

Does the get the end device family query the device every single loop? If so it might be better to cash it at startup and then just use the cash value in the loop.

[jfinken]

Does the get the end device family query the device every single loop? If so it might be better to cash it at startup and then just use the cash value in the loop.

Sorry, which loop? In vectornav.cc, I am only calling determineDeviceFamily() in the public connect() function. So this should only get called once when connecting to the sensor, unless I am missing something.

[dawonn]

You're right, I didn't looks close enough. ;)