Light Transport; Low Wing; 2 Turboprop Eng
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 60; Flight Crew Total 14000; Flight Crew Type 4500
Communication Breakdown; Time Pressure; Confusion; Distraction; Situational Awareness
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Human Factors; Procedure
Departed DTS with a clearance and VFR squawk from Eglin approach. Instructed to 'remain 1 mile south of the coast until airborne contact with Eglin'. At 400 feet and turning west south of the coast; contacted Eglin and they verified radar contact. Eglin then proceeded to get very busy and gave multiple instructions to multiple civilian and military aircraft; of which it was not possible to decipher which instructions were for whom. As I am flying along at 1000 feet westbound; I determine that Eglin is instructing me to contact Hurlburt tower as I am about to penetrate the boundary of Hurlburt class D while under positive control from Eglin. I am not sure if I established contact with HRT tower before penetrating their class D.  DTS absolutely needs a VFR departure procedure which does not require initial contact with Eglin (such as 'departure 14'; proceed east on 120 heading or west on heading 210 at or below 1200 MSL until contact with Eglin. If unable to establish two-way radio communication proceed...') although DTS is presently constructing a control tower; I believe in the absence of a VFR dep procedure; the tower will only create IFR-like flow control for all traffic regardless of VFR/IFR ops.
Pilot while under flight following is not sure if he penetrated a Class D airspace.  Pilot described a possible departure procedure to help with this problem.