Until recentrly I had a 8-meter Inflatable with a F250 yamaha outboard . I also had (and still have) a combo GPS - NorthStar 6600 (former Navman 660) with its fuel kit installed which gave me excellent readings about consumption etc. The GPS is discontinued. Now, I bought a F300 Yamaha, and want to use its nmea output to have the fuel measurements shows on the GPS without( the analog) fuel kit. I want the data about the GPS speed and the consumption rate to be fed into the GPS. I know that it is possible, but HOW. Do I need any special cable?

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