TackTick T122 NMEA interface not repeating DPT input

[allene]

I have a TackTick T122 nmea interface. I have a computer hooked up to the T122 NMEA out and NMEA2 input. I have an Airmar smart depth connected to the NMEA1 input also labeled GPS. I am not getting DPT sentences from the NMEA output as I should according to the manual.

My system is basically a T104 without the T912 plus the Airmar DT820PV-235-0
Here are some examples:

NMEA input 1 (Airmar Smart Depth nmea-0183)
$SDDPT,2.0,*7B
$SDDBT,6.9,f,2.0,M,1.1,F*0B
$YXMTW,22.5,C*17

NMEA input 2 (computer)
$PTAK,TWC,0.0,2*7E

My problem is I do not get the DPT sentences repeated even though the manual for the T122 says they will be transmitted.

NMEA Sentences (0183 V2.30)
Received Sentences: DBT, DPT, GLL, HDG, HDM, MTW, MWV, RMB, RMC, VHW, VLW, VWR.
Transmitted Sentences: DPT, GLL, HDG, MTW, MWV, RMB, RMC, VHW, VLW, VWR.
Note: Only information available will be transmitted.

Here is what I read from the nmea output (computer)
$IIMTW,+20.0,C*3A
$IIMWV,080,R,09.2,N,A*10
$IIMWV,105,T,09.8,N,A*10
$IIVHW,,,155,M,04.7,N,,*66
$IIVLW,00689,N,007.2,N*51
$IIVWR,077,R,09.2,N,,,,*6A
$IIHDG,155,,,14,E*16

I want the computer to be able to read the DPT data and the manual says it should be transmitted.

How can I get the T122 to transmit the DPT data?