"Rick & Linda Bernard" wrote in message ...
From the Garmin.com web site-

Technical Support - Monday - Friday
- 8:00 a.m. - 5:00 p.m. CST
- (closed holidays)
- (913) 397-8200 or 1-800-800-1020

I am sure the tech support folks would be glad to hear from you. If
you do call post your results.

I did, by email. Here is the reply..Ron P.

Thank you for contacting Garmin International

No, I'm sorry but the GPSMAP162 is designed so that you use either the
internal or the external antenna but not to alternate between the two types
of antennas. In order to fulfill your needs and find a unit that does I
would suggest checking out some of the other units at www.garmin.com.

Have a Happy Holiday Season!


Sincerely,

Robert D. Haggy
Product Support Specialist
Garmin International
1-800-800-1020
http://www.garmin.com
Fax 1-913-397-0836